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nac
Thorne NAC - N-Acetylcysteine 500 mg (90 Capsules)Review 2026
Thorne NAC 500mg scores 85/100 BUY. Tier 1 practitioner-grade NAC with single-ingredient purity, Third-Party Certified, $0.73 CPED. Premium tier complement to Now Foods value-tier in DosedWise NAC dual-tier coverage.
EDE Score
Verdict
Cost per effective day
$0.73 / effective day/ day
Why this verdict
- Tier 1 practitioner-grade brand with clinical full dose 1000 mg daily NAC
- Third-Party Certified for label claims and contaminant absence verification
- Thorne 7th catalog entry consolidates Tier 1 brand depth across foundational supplements
Verdict: BUY (premium tier). EDE Score 85/100. Thorne NAC is the Tier 1 practitioner-grade premium tier complement to Now Foods NAC (BUY 83, value-tier with cofactors) in the DosedWise NAC category, completing dual-tier coverage. Per single capsule: 500 mg N-Acetylcysteine (single ingredient). At brand-recommended 1 capsule 2-3 times daily, the product delivers 1000-1500 mg total NAC daily. Single-ingredient formulation without cofactors (vs Now Foods which includes selenium L-Selenomethionine + molybdenum cofactors). Thorne is Tier 1 practitioner-grade brand established 1984 with own manufacturing facility NSF Certified for Sport-registered, USOPC partnership, 100+ professional sports team partnerships, and #1 recommended clinical brand status per 2023 Health-Care Practitioner Seller Survey. This product specifically carries Thorne's general Third-Party Certified verification (label claims + contaminant testing) but is NOT NSF Certified for Sport for this specific SKU (distinct from Thorne's NSF Sport-certified products like Thorne Creatine NSF Sport TOP PICK 94 or Thorne Vitamin D-5000 NSF Sport BUY 89). The 85/100 BUY score is constrained by absence of cofactors (Dose Efficacy 88 vs Now Foods 90), intrinsic oral NAC bioavailability ceiling (~6-10 percent first-pass metabolism, applies to all oral NAC products), and CPED 70 (mid-premium $0.73 versus Now Foods value $0.18, approximately 4x CPED differential). Best buy for buyers wanting Tier 1 practitioner-grade NAC with Thorne brand consistency for stack-building, willing to pay premium for brand tier over cofactor-completeness offered by Now Foods.
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At a glance
| Metric | Value |
|---|---|
| Brand | Thorne |
| Product | NAC - N-Acetylcysteine 500 mg (90 Capsules), also branded CystePlus |
| Form | Capsule (Hypromellose, vegan-friendly) |
| Container size | 90 capsules |
| Servings per container | 45 (at 2 capsules per serving brand-recommended) |
| Daily dose | 1 capsule 2-3 times daily per brand recommendation |
| Total daily NAC at 2 caps | 1000 mg |
| Total daily NAC at 3 caps | 1500 mg |
| Active ingredient per capsule | N-Acetyl-L-Cysteine 500 mg |
| Form type | Standard N-Acetyl-L-Cysteine (no patented enhancement) |
| Cofactors included | None (pure NAC, no selenium or molybdenum) |
| Other ingredients | Hypromellose (cellulose capsule), Leucine, Silicon Dioxide |
| Manufacturer | Thorne (Summerville SC, est. 1984, Tier 1 practitioner-grade) |
| Manufacturing facility | NSF Certified for Sport-registered, cGMP-compliant |
| Third-party testing | Third-Party Certified (Thorne general program) |
| Sport certification for this SKU | None (NOT NSF Sport) |
| Free of | Gluten, dairy, soy |
| Price retail | $33 (90 capsules brand-direct) |
| CPED at 2 caps/day clinical | $0.73 per effective day |
| Annual cost at 2 caps/day | Approximately $266 |
| Best-in-class CPED for NAC category | Omitted (no TOP PICK in NAC category) |
| EDE Score | 85/100 |
| Verdict | BUY (premium tier) |
Why this product matters for men 40+
Thorne NAC is the Tier 1 practitioner-grade premium tier entry in the DosedWise NAC category, complementing Now Foods NAC (BUY 83, $0.18 CPED, value-tier with cofactors). The dual-tier structure provides genuine choice based on buyer profile rather than quality compromise on the underlying NAC.
NAC (N-Acetyl Cysteine) supplementation supports multiple endpoints relevant to men 40+:
- Glutathione synthesis: Cysteine (provided by NAC) is the rate-limiting amino acid for glutathione synthesis. Glutathione is the body's primary intracellular antioxidant, and intracellular glutathione status declines with age.
- Liver protection: NAC supports hepatic glutathione status, particularly relevant during chronic alcohol use, environmental toxin exposure, and high oxidative stress periods.
- Mucolytic effect: NAC reduces mucus viscosity, supporting respiratory health for COPD, chronic bronchitis, and seasonal respiratory challenges.
- Mental health support: Modest benefit for compulsive behaviors, OCD, and bipolar disorder maintenance per Berk 2008 systematic review.
- Cardiovascular support: NAC reduces homocysteine (independent cardiovascular risk factor) per Wiklund 1996.
- Male fertility: NAC at 600 mg/day improved sperm parameters in oligospermic men per Safarinejad 2009.
The choice between Thorne NAC and Now Foods NAC within the DosedWise NAC category comes down to:
Choose Thorne NAC for:
- Tier 1 practitioner-grade brand consistency with other Thorne products in stack
- Single-ingredient pure NAC without selenium/molybdenum cofactors (separate cofactor management or no cofactor preference)
- Functional medicine practitioner-recommended brand consistency
- Mayo Clinic Store distribution and practitioner dispensary availability
- Comfort with Tier 1 brand premium (approximately 4x CPED versus Now Foods)
Choose Now Foods NAC for:
- CPED economics (approximately $200 annual savings versus Thorne)
- Cofactor completeness (selenium L-Selenomethionine + molybdenum included)
- Mainstream value-tier brand experience
- Tier 2 mid-tier brand acceptable
For men 40+ building NAC into foundational supplementation, both products are appropriate within their respective tiers. The functional medicine practitioner-recommended pathway favors Thorne (Tier 1 brand consistency with other Thorne products); the cost-conscious self-directed pathway favors Now Foods (cofactor completeness at value-tier pricing).
Editorial commentary
Thorne NAC is the seventh Thorne entry in the DosedWise catalog, joining:
- Thorne Zinc Picolinate 30 mg (TOP PICK 94, $0.33 CPED, zinc category benchmark)
- Thorne Magnesium Bisglycinate (BUY 88, $1.25 CPED, magnesium category)
- Thorne Vitamin D + K2 Liquid (BUY 81, $0.20 CPED, vitamin D category)
- Thorne Vitamin D-5000 NSF Sport (BUY 89, $0.33 CPED, vitamin D NSF Sport tier)
- Thorne Creatine NSF Sport (TOP PICK 94, $0.49 CPED, creatine category benchmark)
- Thorne NAC (BUY 85, $0.73 CPED, NAC premium tier, this product)
Thorne brand consistency is well-established across 6 prior catalog entries with all earning BUY-or-better verdicts. The brand consistency demonstrates Tier 1 practitioner-grade quality across foundational supplement categories at consistent 95 Manufacturer Reputation score.
The NAC product specifically combines:
- 500 mg N-Acetyl-L-Cysteine per capsule (single ingredient pure NAC)
- Brand recommendation: 1 capsule 2-3 times daily (1000-1500 mg/day total)
- Hypromellose vegetable capsule (vegan-friendly)
- Leucine and silicon dioxide as inactive ingredients
- 90 capsule container ($33 retail brand-direct = $0.73 CPED at 2 caps/day clinical full)
- Manufactured in Thorne owned facility (Summerville, South Carolina)
- NSF Certified for Sport-registered facility (facility-level certification)
- Third-Party Certified for label claims and contaminant absence
- Free from gluten, dairy, soy
Three structural features distinguish this product within the NAC category, with one significant editorial concern.
The first is Tier 1 practitioner-grade brand reputation. Thorne is the gold-standard practitioner-grade supplement brand with 40+ years of operating history, USOPC partnership, 100+ professional sports team partnerships, and #1 recommended clinical brand status per 2023 Health-Care Practitioner Seller Survey. Functional medicine practitioners (MDs, DOs, NDs, NPs, RDs working in functional medicine, integrative medicine, sports medicine settings) commonly specifically recommend Thorne brand for patient consistency. The Thorne brand premium reflects practitioner endorsement, dispensary distribution access, and Mayo Clinic Store distribution rather than formulation quality compromise versus alternatives.
The second is single-ingredient pure NAC formulation. Thorne NAC contains only NAC with minimal necessary capsule and inactive ingredients (Hypromellose capsule, Leucine, Silicon Dioxide). No selenium, no molybdenum, no other cofactors. The single-ingredient formulation is editorially distinct from Now Foods NAC which includes selenium L-Selenomethionine 50 mcg + molybdenum 100 mcg per 2-capsule dose. Buyers preferring pure NAC without cofactor complications choose Thorne; buyers preferring mechanistic cofactor completeness choose Now Foods.
The third is Third-Party Certified status BUT NOT NSF Sport for this specific product. Thorne uses two distinct certification tiers across its product line:
- NSF Certified for Sport (gold-standard tier): per-batch testing for over 280 banned substances, manufacturing facility NSF Sport-registered. Available on select Thorne products including Thorne Creatine NSF Sport (DosedWise TOP PICK 94), Thorne Vitamin D-5000 NSF Sport (DosedWise BUY 89), Thorne Whey Protein Isolate NSF Sport, Thorne Glutathione-SR NSF Sport, Thorne Basic Nutrients 2/Day NSF Sport, Thorne FloraSport 20B NSF Sport.
- Third-Party Certified (Thorne general program): independent laboratory verification of label claims and contaminant absence without per-batch banned substance testing. Standard across most Thorne products including Thorne NAC (this product), Thorne Magnesium Bisglycinate, Thorne Zinc Picolinate, Thorne NiaCel 400, Thorne Curcumin Phytosome.
The NSF Sport certification is a meaningful tier above general Third-Party Certified for drug-tested athletes and provides per-batch banned substance verification. For non-drug-tested users, the Third-Party Certified status provides credible third-party verification but at lower verification rigor. The Third-Party Testing 85 score reflects this verification tier (above 70 for brand-claimed-only without third-party verification, below 90-95 for NSF Sport per-batch).
The structural editorial conclusion: Thorne NAC is the rational BUY for buyers wanting Tier 1 practitioner-grade NAC with Thorne brand consistency. The product delivers clinical full daily dose (1000-1500 mg at 2-3 caps/day), Tier 1 brand reputation, Third-Party Certified verification, and single-ingredient purity at mid-premium CPED. The 85/100 BUY score reflects:
- Clinical full dose 1000 mg/day at 2 caps without cofactors (Dose Efficacy 88, vs Now Foods 90 with cofactors)
- Intrinsic oral NAC bioavailability ceiling (~6-10 percent first-pass metabolism, identical across all oral NAC products)
- Third-Party Certified status without NSF Sport for this specific product (Third-Party Testing 85)
- CPED $0.73 at mid-premium tier (CPED 70 vs Now Foods 100)
- Tier 1 manufacturer reputation (95) and excellent label transparency (95) reaching above the methodology minimum for BUY tier
For buyers wanting NSF Sport-certified NAC, no Thorne NAC product currently carries NSF Sport certification; few NAC products in the broader market carry NSF Sport (limited drug-tested athlete relevance for NAC).
The NAC category in our DosedWise catalog now has dual-tier complete coverage:
- Thorne NAC (BUY 85, $0.73 CPED, this product): Tier 1 practitioner-grade premium tier with single-ingredient purity. Choose for Thorne brand consistency in stack-building.
- Now Foods NAC (BUY 83, $0.18 CPED): Tier 2 mid-tier value with selenium + molybdenum cofactor completeness. Choose for CPED economics and mechanistic cofactor formulation.
What is actually in it
| Ingredient | Form | Dose per capsule | Daily Value | Clinical effective dose | Evidence level |
|---|---|---|---|---|---|
| N-Acetylcysteine (NAC) | N-Acetyl-L-Cysteine | 500 mg | not established | 600-2400 mg/day depending on endpoint | strong |
Other ingredients (inactives): Hypromellose (cellulose capsule, vegan-friendly), Leucine (capsule lubricant, branched-chain amino acid), Silicon Dioxide (anti-caking agent).
The clinical effective dose for NAC varies by endpoint:
- General antioxidant and glutathione support: 600-1200 mg/day per Examine.com synthesis
- Liver protection during alcohol or environmental exposure: 1200-1800 mg/day
- Mental health (compulsive behaviors, OCD, addiction): 1200-2400 mg/day per Berk 2008
- Mucolytic for COPD/chronic bronchitis: 1200-1800 mg/day per Decramer 2005
- Male fertility: 600 mg/day per Safarinejad 2009
Thorne at brand-recommended 2 capsules daily (1000 mg/day) is at clinical full dose for general antioxidant support and at low-end for psychiatric/mucolytic applications. At 3 capsules daily (1500 mg/day), the dose is appropriate for most clinical endpoints. The brand-recommended range (2-3 caps/day) provides flexibility based on user needs.
The single-ingredient formulation is a structural feature that deserves specific editorial attention. Thorne NAC contains only NAC with minimal necessary capsule and inactive ingredients. No selenium, no molybdenum, no vitamin C (which can affect NAC stability), no other added ingredients. The minimalist formulation is editorially clean for buyers preferring pure NAC delivery.
Cofactor consideration: Buyers wanting the cofactor mechanism (selenium for glutathione peroxidase enzyme activity, molybdenum for sulfite oxidase detoxifying NAC metabolism byproducts) can either: (1) choose Now Foods NAC which includes these cofactors at the same daily dose tier, or (2) supplement separately with standalone selenium and molybdenum products. The choice depends on buyer preference for single-product formulation versus separate ingredient management.
Notably absent: No proprietary blends. No artificial colors. No artificial flavors. No sweeteners. No allergens (gluten-free, dairy-free, soy-free per brand disclosure). Vegan-friendly capsule format.
Leucine inclusion: Thorne uses Leucine (a branched-chain amino acid) as a capsule processing aid. This is a clean alternative to magnesium stearate (used by some other supplement brands) and provides a small amount of additional amino acid content.
EDE Score breakdown
| Criterion | Weight | Score (0-100) | Weighted contribution |
|---|---|---|---|
| Dose Efficacy | 30% | 88 | 26.4 |
| Bioavailability | 20% | 80 | 16.0 |
| Third-Party Testing | 15% | 85 | 12.75 |
| Label Transparency | 15% | 95 | 14.25 |
| Manufacturer Reputation | 10% | 95 | 9.5 |
| Community Sentiment | 5% | 50 | 2.5 |
| Price Per Effective Dose | 5% | 70 | 3.5 |
| Total EDE Score | 100% | 85/100 |
Notes on each criterion:
Dose Efficacy (88): At brand-recommended 2 capsules daily: 1000 mg total NAC. At 3 capsules daily: 1500 mg total NAC. Clinical effective dose for general antioxidant and glutathione support is 600-1200 mg/day per Examine.com synthesis. The 2-cap/day dose is at clinical full general support. NO cofactors (selenium, molybdenum) included. Compared to Now Foods NAC (BUY 83) which includes selenium L-Selenomethionine 50 mcg + molybdenum 100 mcg cofactors at the same daily dose tier (Dose Efficacy 90), Thorne provides pure NAC without mechanistic cofactor completeness. Score 88 reflects clinical full dose at 2 caps/day with no cofactors. -2 vs Now Foods Dose Efficacy 90 (the cofactor inclusion advantage). For psychiatric/mucolytic applications requiring 1200-2400 mg/day, Thorne 3-cap dose (1500 mg) is at clinical mid-range.
Bioavailability (80): Standard N-Acetyl-L-Cysteine form (non-patented synthetic NAC, identical chemistry to all consumer NAC products). Oral NAC bioavailability is approximately 6-10 percent (variable, dose-dependent) per Olsson 1988 and Borgstrom 1986 due to extensive first-pass metabolism in the intestinal wall and liver. This intrinsic bioavailability ceiling applies to all oral NAC products and is not a Thorne-specific limitation. Hypromellose vegetable capsule for clean dissolution. Score 80 reflects intrinsic oral NAC bioavailability limit. Same score as Now Foods NAC (80) which uses identical NAC form. Higher bioavailability variants exist (NAC ethyl ester, liposomal NAC, effervescent PharmaNAC) but are generally not in widespread mainstream consumer market and not validated by NAC-specific RCTs.
Third-Party Testing (85): Thorne Third-Party Certified program: independent laboratory verification of label claims and contaminant absence. Manufacturing facility is NSF Certified for Sport-registered (facility-level certification). However, THIS specific product does NOT carry NSF Certified for Sport designation per individual SKU verification. Distinct from Thorne products in DosedWise catalog that DO have NSF Sport (Thorne Vitamin D-5000 NSF Sport BUY 89, Thorne Creatine NSF Sport TOP PICK 94). Per methodology rubric: Thorne Third-Party Certified + NSF Sport-registered facility but no per-batch NSF Sport certification for this specific product = 85 score. Above Now Foods NAC (70, NPA A-rated GMP + UL Certified at lower tier transparency than Thorne Third-Party Certified). Below NSF Sport per-batch products (90-95).
Label Transparency (95): Full disclosure: NAC 500 mg per capsule (form specified as N-Acetylcysteine, also marketed as CystePlus registered trademark). All inactive ingredients disclosed (Hypromellose vegetable capsule, Leucine, Silicon Dioxide). Single-ingredient core formulation. Allergen disclosure (gluten-free, dairy-free, soy-free). FDA disclaimer present. Methodology rubric: complete ingredient disclosure with single-ingredient transparency = 95 score. Not 100 because daily dose recommendation requires reading directions ("1 capsule 2-3 times daily") rather than appearing prominently as serving size on supplement facts panel.
Manufacturer Reputation (95): Thorne Research = Tier 1 practitioner-grade supplement brand. Established 1984 in Summerville, South Carolina. Own manufacturing facility NSF Certified for Sport-registered. Trusted by 100+ professional sports teams across NCAA, NFL, MLB, NBA, NHL, MLS. Official USOPC partner. Used by major league sports clinical staffs. #1 recommended clinical brand by health-care practitioners per 2023 Health-Care Practitioner Seller Survey. Mayo Clinic Store distribution. No FDA recalls. Existing DosedWise catalog presence: 6 prior Thorne reviews (Zinc Picolinate TOP PICK 94, Magnesium Bisglycinate BUY 88, Vitamin D + K2 Liquid BUY 81, Vitamin D-5000 NSF Sport BUY 89, Creatine NSF Sport TOP PICK 94). Brand consistency well-established at 95 across all entries. Per methodology rubric: Tier 1 practitioner-grade with own manufacturing and decades of clinical trust = 95.
Community Sentiment (50): Phase 1 default. Reddit Intelligence layer arrives Q3 2026.
Price Per Effective Dose (70): CPED $0.73 per effective day at 2 capsules clinical full dose ($33 / 45 days). Within $0.50-$1.00 band per methodology = score 70 baseline. No adjustment up because: (1) Now Foods NAC delivers equivalent clinical mechanism plus cofactors at $0.18 CPED (approximately 4x CPED differential, $200+ annual savings); (2) competitive Tier 1 NAC products (Pure Encapsulations NAC, Designs for Health NAC) deliver similar quality at $0.50-0.65 CPED. Annual cost approximately $266 for daily 2-cap NAC supplementation, $400 for 3-cap. CPED is the largest contributor to the EDE differential vs Now Foods NAC despite Thorne's Tier 1 brand reputation premium.
What we like
- Clinical full daily dose 1000 mg NAC at brand-recommended 2 capsules daily. Meets Examine.com clinical range for general antioxidant and glutathione support (600-1200 mg/day). At 3 caps/day (1500 mg), dose is appropriate for psychiatric and mucolytic applications.
- Single-ingredient pure NAC formulation. No selenium, no molybdenum, no other ingredients beyond minimal capsule and inactive ingredients. The cleanest possible NAC delivery for buyers preferring pure single-ingredient products.
- N-Acetyl-L-Cysteine standard form with no patented enhancement claims. Proven form across 50+ years of clinical research literature.
- Hypromellose vegetable capsule format. Vegan-friendly. Free from gluten, dairy, soy.
- Leucine inclusion as capsule processing aid (instead of magnesium stearate). Clean alternative for buyers avoiding magnesium stearate.
- Tier 1 practitioner-grade brand reputation. Thorne is the #1 recommended clinical brand by health-care practitioners per 2023 Health-Care Practitioner Seller Survey, USOPC partner, 100+ professional sports team partnerships.
- Thorne owned manufacturing facility (Summerville, South Carolina). NSF Certified for Sport-registered facility (facility-level certification). cGMP-compliant.
- Third-Party Certified verification: independent laboratory testing for label claim accuracy and contaminant absence.
- 40+ years operating history. Thorne established 1984 with consistent practitioner-grade brand positioning.
- Mayo Clinic Store distribution. Practitioner dispensary availability via Fullscript and Wellevate. Wide retail (Amazon, Vitacost, Thrive Market, brand-direct).
- Brand consistency for stack-building. Existing DosedWise catalog presence: 6 prior Thorne entries with all earning BUY-or-better verdicts. Buyers can build comprehensive Thorne stack across foundational categories (Zinc + Magnesium + Vitamin D + K2 + Creatine + NAC).
- 90-capsule bottle provides 45-day supply at clinical full 2-cap dose. 180-capsule variant available for committed users.
- FSA/HSA eligible via Truemed integration on Thorne's brand-direct website.
- No GI side effects commonly reported. Thorne formulation generally well-tolerated.
What we don't like
- NOT NSF Certified for Sport for this specific product. Drug-tested athletes (NCAA, NFL, MLB, NBA, NHL, USOPC, World Athletics, PGA Tour) cannot use this product without certification verification gap. Thorne has NSF Sport certification for several other products (Creatine, Vitamin D-5000, Whey Protein Isolate, Glutathione-SR, Basic Nutrients 2/Day, FloraSport 20B), but NAC specifically does not carry NSF Sport. Few NAC products in broader market carry NSF Sport.
- Approximately 4x CPED versus Now Foods NAC ($0.73 vs $0.18). The Tier 1 brand premium does not translate to functional advantage for buyers who can accept Tier 2 mid-tier brand. Annual cost differential approximately $200 ($266 Thorne vs $66 Now Foods).
- No cofactors (selenium, molybdenum) included. Now Foods NAC includes selenium L-Selenomethionine 50 mcg + molybdenum 100 mcg per 2-capsule dose for mechanistic cofactor completeness. Thorne provides pure NAC; buyers wanting cofactor mechanism need to either choose Now Foods or supplement separately with standalone selenium and molybdenum products.
- Intrinsic oral NAC bioavailability is approximately 6-10 percent due to extensive first-pass metabolism. This is not a Thorne-specific limitation; all oral NAC products share this constraint. Higher bioavailability variants (NAC ethyl ester, liposomal NAC, effervescent PharmaNAC) exist but are generally outside mainstream consumer market.
- Brand-recommended dose range "1 capsule 2-3 times daily" creates dose ambiguity. Some retailers (Village Green Apothecary) say "1 capsule daily"; others (Pure Prescriptions, Thrive Market) say "2-3 times daily". Brand-direct guidance is "2-3 times daily" but the wide range may confuse buyers about appropriate dose for their specific use case.
- Bottle duration variability based on dose. At 1 cap/day: 90 days. At 2 caps/day: 45 days. At 3 caps/day: 30 days. The 90-capsule bottle is short for committed users at 3-cap dose; 180-capsule variant is more economical for high-dose users.
- No public batch Certificate of Analysis disclosure on website per individual lot. Some Tier 1 practitioner-grade brands provide downloadable CoA per batch; Thorne provides Third-Party Certified status but does not disclose individual batch testing results publicly.
- Higher CPED tier than competitive Tier 1 NAC products. Pure Encapsulations NAC (similar Tier 1 practitioner-grade) at $0.50-0.65 CPED. Designs for Health NAC at $0.50-0.65 CPED. Thorne NAC at $0.73 is at upper end of Tier 1 NAC pricing.
- Brand premium reflects Thorne's general positioning rather than product-specific quality differentiation. Thorne NAC is functionally equivalent to other standard NAC products at the molecular level; the premium pricing reflects brand and manufacturing reputation rather than formulation advantages.
- iHerb distribution not confirmed (search results did not surface iHerb listing for Thorne NAC, distinct from other Thorne products which have iHerb item numbers). Buyers preferring iHerb sourcing should verify availability.
Cost per effective day (CPED)
Bottle price (retail brand-direct): $33.00 (90 capsules)
Servings per bottle at 2 caps/day clinical full: 45 (2 capsules per serving)
Days at 2 caps/day clinical full dose: 45 days
CPED: $33.00 / 45 = $0.733 per effective day
Thorne NAC costs $0.73 per effective day at clinical full dose (1000 mg NAC daily from 2 capsules).
For comparison within the NAC category:
| Product | NAC per cap | Daily caps | Cofactors | Sport Cert | Brand Tier | CPED | EDE Score | Verdict |
|---|---|---|---|---|---|---|---|---|
| Thorne NAC | 500 mg | 2 | None | Third-Party Certified (not NSF Sport) | Tier 1 practitioner | $0.73 | 85 | BUY (this product) |
| Now Foods NAC 600 mg | 600 mg | 2 | Se + Mo | None | Tier 2 mid-tier | $0.18 | 83 | BUY |
| Pure Encapsulations NAC (future review) | 600 mg | 2 | None | None | Tier 1 practitioner | ~$0.55 | future | future |
| Designs for Health NAC (future review) | 600 mg | 2 | None | None | Tier 1 practitioner | ~$0.60 | future | future |
| BulkSupplements NAC (future review) | varies | varies | None | None | commodity | ~$0.10 | future | future |
| PharmaNAC effervescent (future review) | 600 mg | 1-2 tablets | None | None | premium specialty | ~$0.80 | future | future |
The bestInClassCPED for the NAC category is omitted (no TOP PICK in NAC category yet, both current entries are BUY tier).
The CPED $0.73 reflects:
- Tier 1 practitioner-grade brand pricing structure
- Mid-premium positioning vs Tier 2 mid-tier alternatives
- Single-ingredient pure NAC without cofactor inclusion (no cofactor cost included)
- 90-capsule bottle size (shorter duration at clinical 2-cap dose vs 180-capsule alternatives)
- Thorne brand premium (USOPC partnership, practitioner endorsement, Mayo Clinic Store distribution)
For comparison, building Thorne NAC + Now Foods Selenium L-Selenomethionine + Now Foods Molybdenum stack to match Now Foods NAC cofactor completeness: approximately $0.73 NAC + $0.05 Se + $0.05 Mo = $0.83 CPED total. The Thorne+separate cofactor stack still costs approximately 4.6x Now Foods NAC ($0.83 vs $0.18) for equivalent functional formulation. This reflects the underlying brand tier differential rather than cofactor-specific cost.
For buyers willing to pay Tier 1 brand premium, Thorne NAC provides Tier 1 practitioner-grade NAC at competitive pricing within Tier 1 segment. For buyers prioritizing CPED economics, Now Foods NAC delivers equivalent clinical mechanism plus cofactors at approximately 4x lower CPED.
Ingredient-by-ingredient analysis
N-Acetylcysteine (NAC) - 500 mg per capsule
Dose in this product: 500 mg per capsule (1000 mg daily at 2 capsules brand-recommended, 1500 mg at 3 capsules) Form: N-Acetyl-L-Cysteine (standard synthetic NAC, no patented enhancement) Clinical effective dose: 600-2400 mg/day depending on endpoint Evidence level: Strong across multiple endpoints Verdict for this ingredient: Clinical full dose for general support, no cofactors
NAC (N-Acetyl Cysteine) is a stable form of the amino acid cysteine, with an acetyl group attached to the amino terminus. The acetylation provides oral stability (preventing rapid oxidation of the cysteine thiol group) and enables absorption from the digestive tract. After absorption, NAC is deacetylated to cysteine, which then enters the glutathione synthesis pathway as the rate-limiting amino acid.
Major clinical mechanisms:
- Glutathione synthesis substrate: Cysteine availability is the rate-limiting factor in glutathione synthesis. Oral NAC raises plasma cysteine and intracellular glutathione per Atkuri 2007 review.
- Direct antioxidant: NAC's thiol group directly scavenges hydroxyl radicals, hypochlorous acid, and other reactive oxygen species independent of glutathione synthesis.
- Mucolytic action: NAC reduces mucus viscosity by breaking disulfide bonds between mucoprotein chains. This mechanism underlies the FDA-approved Mucomyst inhalation drug for COPD/chronic bronchitis.
- Hepatoprotective: NAC restores hepatic glutathione status, particularly relevant during acetaminophen overdose (FDA-approved IV indication) and chronic alcohol exposure.
- Mental health applications: NAC modulates glutamate signaling and oxidative stress in CNS tissues; clinical trials show benefit for compulsive behaviors, OCD, bipolar disorder.
Major clinical evidence:
- Berk 2008 systematic review: NAC supplementation provides modest benefit for psychiatric conditions including bipolar disorder, OCD, addiction.1
- Decramer 2005 BRONCUS trial: NAC at 600 mg/day in COPD patients showed reduction in exacerbations.2
- Safarinejad 2009: NAC at 600 mg/day improved sperm motility, morphology, and concentration in oligospermic men.3
- Atkuri 2007 review: Comprehensive review of NAC mechanisms and clinical applications.4
Form: Standard N-Acetyl-L-Cysteine (synthetic). Identical to Now Foods NAC and most consumer NAC products. No patented enhancement claims (versus PharmaNAC effervescent, NAC ethyl ester, or liposomal NAC variants).
The 500 mg per-capsule dose is half the 1000 mg dose used in many clinical trials but is the predominant per-capsule dose across mainstream NAC products. At Thorne's brand-recommended 2-3 caps/day, total daily dose is 1000-1500 mg matching clinical effective range.
Cofactor Absence
Cofactors in product: None Cofactors mechanistically synergistic with NAC: Selenium (cofactor for glutathione peroxidase) + Molybdenum (cofactor for sulfite oxidase) Verdict: Pure NAC without cofactors (vs Now Foods NAC which includes both)
The cofactor absence is the primary editorial differentiation between Thorne NAC and Now Foods NAC:
- Selenium absence: Selenium is the cofactor for glutathione peroxidase (GPx), the enzyme that uses glutathione to reduce hydrogen peroxide and lipid peroxides. Without adequate selenium, GPx activity is limited even with elevated glutathione levels from NAC supplementation. Thorne provides no selenium; Now Foods provides 50 mcg L-Selenomethionine (premium chelated form) per 2-cap dose.
- Molybdenum absence: Molybdenum is the cofactor for sulfite oxidase, which detoxifies sulfites produced as intermediates from NAC metabolism. Thorne provides no molybdenum; Now Foods provides 100 mcg sodium molybdate per 2-cap dose.
For buyers wanting cofactor completeness with NAC supplementation:
- Choose Now Foods NAC for built-in cofactor formulation at value-tier CPED
- Stack Thorne NAC with separate cofactors: Add Now Foods Selenium L-Selenomethionine ($0.05 CPED) + Now Foods Molybdenum ($0.05 CPED) = +$0.10 CPED to Thorne baseline. Total Thorne stack: $0.83 CPED for cofactor-complete formulation.
For buyers preferring pure single-ingredient NAC without cofactor complexity:
- Thorne provides this directly at $0.73 CPED
- Standalone alternatives include Pure Encapsulations NAC and Designs for Health NAC (also single-ingredient) at competitive CPED
Hypromellose Capsule and Inactive Ingredients
Hypromellose: Cellulose-derived vegetable capsule. Vegan-friendly. Standard premium capsule format. Leucine: Branched-chain amino acid used as capsule processing aid (alternative to magnesium stearate). Clean inactive ingredient with minor additional amino acid content. Silicon Dioxide: Anti-caking agent, minimal amount.
The inactive ingredient profile is clean. Leucine inclusion (instead of magnesium stearate) is editorially distinct and may appeal to buyers avoiding magnesium stearate.
FDA Enforcement Note (Resolved)
Regulatory history: FDA briefly raised regulatory concerns about NAC as a supplement in July 2020. Industry pushback occurred. August 2022: FDA issued final guidance allowing NAC supplements to remain on market under enforcement discretion policy. NAC is firmly established as a legal supplement; the brief regulatory uncertainty is resolved.
Thorne continuously distributed NAC throughout the regulatory uncertainty period.
Community sentiment summary
Phase 1 default sentiment score: 50/100.
DosedWise will publish aggregated Reddit sentiment for Thorne NAC across r/Supplements, r/Nootropics, r/Longevity, r/PeterAttia, and r/FunctionalMedicine in Q3 2026 when our Reddit Intelligence layer ships. Until then, this criterion uses a neutral default and represents 5 percent of the total EDE Score.
Anecdotal user feedback on Reddit longevity, supplement, and functional medicine communities skews strongly positive on Thorne NAC quality and on the brand more broadly. The product has high Amazon review volume (1,800+ reviews at 4.7 stars). The most common positive comments highlight brand consistency, clean formulation, no GI side effects, and Tier 1 practitioner endorsement. The most common third-party critique focuses on CPED versus Now Foods NAC (4x differential) and absence of cofactors. Some users explicitly choose Thorne for stack-building consistency with other Thorne products despite higher CPED versus Now Foods.
Independent reviewers (Healthline, Examine.com community discussions, multiple longevity-focused content creators) consistently include Thorne NAC in best-NAC-product recommendations, often as best-Tier-1-brand pick. Some practitioner-recommended NAC product lists default to Thorne for brand consistency in functional medicine practitioner dispensaries.
[Note: Community sentiment is one signal among seven and is weighted 5 percent in the EDE Score. See methodology.]
Compared to alternatives
For NAC supplementation, Thorne NAC is the Tier 1 practitioner-grade premium tier complement to Now Foods NAC value-tier in the DosedWise NAC category, completing dual-tier coverage:
| Product | Cofactors | Sport Cert | Brand Tier | CPED | EDE Score | Verdict |
|---|---|---|---|---|---|---|
| Thorne NAC | None | Third-Party Certified | Tier 1 practitioner | $0.73 | 85 | BUY (this product) |
| Now Foods NAC 600 mg | Se + Mo | None | Tier 2 mid-tier | $0.18 | 83 | BUY |
| Pure Encapsulations NAC (future review) | None | None | Tier 1 practitioner | ~$0.55 | future | future |
| Designs for Health NAC (future review) | None | None | Tier 1 practitioner | ~$0.60 | future | future |
| BulkSupplements NAC (future review) | None | None | commodity | ~$0.10 | future | future |
| PharmaNAC effervescent (future review) | None | None | premium specialty | ~$0.80 | future | future |
The choice between products comes down to:
- Choose Thorne NAC for Tier 1 practitioner-grade brand consistency with other Thorne products in stack. Buyers building cohesive Thorne stack across DosedWise catalog (Zinc + Magnesium + Vitamin D + K2 + Creatine + NAC) value brand consistency over CPED economics.
- Choose Now Foods NAC for CPED economics with cofactor completeness. Approximately 4x lower CPED ($0.18 vs $0.73), $200+ annual savings, plus mechanistic selenium + molybdenum cofactors.
- Choose Pure Encapsulations or Designs for Health NAC (when reviewed) for alternative Tier 1 practitioner-grade brands at similar tier with potentially better CPED.
Who should buy this
Thorne NAC is best for:
- Men 40+ wanting Tier 1 practitioner-grade NAC supplementation with Thorne brand consistency for stack-building.
- Buyers building cohesive Thorne stack across DosedWise catalog: Zinc Picolinate (TOP PICK 94) + Magnesium Bisglycinate (BUY 88) + Vitamin D + K2 Liquid (BUY 81) + Vitamin D-5000 NSF Sport (BUY 89) + Creatine NSF Sport (TOP PICK 94) + NAC (BUY 85). Comprehensive Thorne foundational stack at consistent Tier 1 practitioner-grade brand.
- Functional medicine patients whose practitioners specifically recommend Thorne brand for patient consistency. Practitioner dispensary availability via Fullscript and Wellevate.
- Buyers preferring single-ingredient pure NAC without cofactor complications. Thorne provides clean single-ingredient delivery.
- Buyers comfortable with Tier 1 brand premium pricing tier (approximately 4x CPED versus Now Foods value-tier alternative).
- Buyers who would otherwise supplement separately with selenium and molybdenum (or who already have these cofactors in multivitamin or other products).
- Buyers wanting Mayo Clinic Store distribution and Tier 1 retail channel access.
- Buyers wanting FSA/HSA eligibility via Truemed integration on Thorne brand-direct.
- Buyers preferring Hypromellose vegetable capsule format with Leucine inactive (instead of magnesium stearate).
- Buyers preferring Third-Party Certified verification status (above brand-claimed-only but below NSF Sport per-batch).
Thorne NAC is NOT for:
- Drug-tested athletes (NCAA, NFL, MLB, NBA, NHL, USOPC, World Athletics, PGA Tour). Thorne NAC does NOT carry NSF Certified for Sport designation despite Thorne's NSF Sport-registered facility. Drug-tested athletes wanting NAC supplementation have limited NSF Sport options across the broader market.
- Cost-conscious buyers prioritizing CPED economics. Choose Now Foods NAC at approximately 4x lower CPED ($0.18 vs $0.73).
- Buyers wanting cofactor completeness in single product. Choose Now Foods NAC for built-in selenium L-Selenomethionine + molybdenum cofactors.
- Buyers requiring higher bioavailability NAC variants (NAC ethyl ester, liposomal NAC, effervescent PharmaNAC). Thorne uses standard N-Acetyl-L-Cysteine subject to intrinsic ~6-10 percent oral bioavailability ceiling.
- Buyers wanting USP Verified products specifically. Thorne has Third-Party Certified status but not USP Verified for this product.
- Buyers wanting public per-batch Certificate of Analysis disclosure. Thorne provides Third-Party Certified status but does not currently disclose individual batch testing results publicly.
- Buyers requiring upper-end NAC doses (1800-2400 mg/day) for psychiatric or mucolytic indications without high CPED. At 3-cap/day for 1500 mg, bottle duration drops to 30 days at $1.10 CPED.
Stacking notes
- Take 1 capsule 2-3 times daily per brand recommendation. Spread doses throughout day for sustained plasma cysteine elevation. Take with food for optimal GI tolerance.
- Combine with comprehensive Thorne stack for maximum brand consistency: Thorne Zinc Picolinate 30 mg (TOP PICK 94, $0.33 CPED), Thorne Magnesium Bisglycinate (BUY 88, $1.25 CPED), Thorne Vitamin D + K2 Liquid (BUY 81, $0.20 CPED) OR Thorne Vitamin D-5000 NSF Sport (BUY 89, $0.33 CPED), Thorne Creatine NSF Sport (TOP PICK 94, $0.49 CPED), Thorne NAC (this product, BUY 85, $0.73 CPED). Total daily CPED for full Thorne foundational stack approximately $3.10-3.33.
- For cofactor completeness, add separate selenium and molybdenum: Now Foods Selenium 200 mcg L-Selenomethionine ($0.05 CPED) + Now Foods Molybdenum 500 mcg ($0.05 CPED). Total Thorne NAC + cofactors stack: $0.83 CPED.
- Or, switch to Now Foods NAC for built-in cofactors at value-tier pricing: Now Foods NAC (BUY 83, $0.18 CPED with selenium + molybdenum cofactors included).
- Foundation pairing with Doctor's Best Ubiquinol Kaneka 100 mg (BUY 86, $0.53 CPED) for combined glutathione + mitochondrial antioxidant defense. NAC supports glutathione synthesis; ubiquinol regenerates oxidized glutathione and provides direct mitochondrial antioxidant function.
- Take separately from prescription medications by 1-2 hours. NAC may interact with nitroglycerin (potentiate vasodilation) and anticoagulants (warfarin INR monitoring recommended).
- Long-term daily supplementation at clinical doses is well-tolerated. Multi-year safety data exists for NAC at 1200-1800 mg/day. No cycling necessary.
- Adequate hydration recommended. NAC supports detoxification pathways; adequate fluid intake supports proper waste elimination.
- For drug-tested athletes, Thorne NAC is NOT NSF Sport certified. Athletes requiring sport certification for NAC supplementation should consult sports medicine staff; NSF Sport-certified NAC products are rare across the broader supplement market.
- Initial GI tolerance variable. Some users experience mild bloating, gas, or sulfur-tinged burps in first week; usually resolves within 7-14 days. Splitting dose throughout day may help versus 2-cap single-dose.
- Asthma patients should consult physician before initiating NAC. Some asthma patients may experience bronchospasm with high-dose NAC, though this is rare with oral supplementation versus inhaled forms.
Better alternatives
If Thorne NAC does not fit your needs:
- Now Foods NAC 600 mg with Selenium and Molybdenum (DosedWise BUY 83, $0.18 CPED): Value-tier alternative with cofactor completeness (selenium L-Selenomethionine + molybdenum). Approximately 4x lower CPED ($200+ annual savings). Choose for CPED economics and mechanistic cofactor formulation.
- Pure Encapsulations NAC (future DosedWise review): Tier 1 practitioner-grade alternative without cofactors. Hypoallergenic formulation. Estimated CPED ~$0.55 (lower than Thorne at similar Tier 1 tier).
- Designs for Health NAC (future DosedWise review): Tier 1 practitioner-grade alternative without cofactors. Estimated CPED ~$0.60.
- BulkSupplements NAC (future DosedWise review): Commodity-tier alternative at lowest CPED (~$0.10 estimated). Pure powder or capsule form without cofactors.
- PharmaNAC effervescent (future DosedWise review): Specialty premium alternative with patented effervescent form for higher bioavailability claims.
- Thorne 180-capsule NAC variant (same product, larger size): Better per-capsule cost for committed users at 3-cap daily dose. Reduces re-purchase friction.
Frequently asked questions
Is Thorne NAC worth buying?
Yes, for buyers wanting Tier 1 practitioner-grade NAC with Thorne brand consistency for stack-building. EDE 85/100 BUY with $0.73 CPED at brand-recommended clinical dose. The product delivers Tier 1 practitioner-grade quality, single-ingredient pure NAC, Third-Party Certified verification, and brand consistency with other Thorne products.
For buyers prioritizing CPED economics, Now Foods NAC delivers equivalent clinical mechanism plus cofactors at approximately 4x lower CPED ($0.18 vs $0.73, $200+ annual savings). The Thorne premium reflects brand tier rather than formulation advantages.
How does Thorne NAC compare to Now Foods NAC?
Both products use the same active ingredient (standard N-Acetyl-L-Cysteine). Both score 80 on Bioavailability (intrinsic oral NAC ceiling, identical for all oral NAC products). The key differences:
| Aspect | Thorne NAC | Now Foods NAC |
|---|---|---|
| NAC per cap | 500 mg | 600 mg |
| Daily dose (brand-rec) | 1000 mg (2 caps) | 1200 mg (2 caps) |
| Cofactors | None | Se 50 mcg + Mo 100 mcg |
| Sport cert | Third-Party Certified (not NSF Sport) | NPA A-rated GMP, UL Certified |
| Brand tier | Tier 1 practitioner | Tier 2 mid-tier |
| CPED | $0.73 | $0.18 |
| Annual cost | $266 | $66 |
| EDE Score | 85 BUY | 83 BUY |
Choose Thorne for Tier 1 brand consistency. Choose Now Foods for CPED economics + cofactors.
Is Thorne NAC NSF Sport certified?
NO. Thorne NAC does NOT carry NSF Certified for Sport designation despite Thorne's NSF Sport-registered facility. The NSF Sport certification applies to specific Thorne products on a per-SKU basis, not facility-wide. Other Thorne products in DosedWise catalog DO have NSF Sport (Thorne Vitamin D-5000 NSF Sport BUY 89, Thorne Creatine NSF Sport TOP PICK 94), but NAC specifically does not.
Drug-tested athletes wanting NSF Sport-certified NAC supplementation have limited options across the broader market; few NAC products carry NSF Sport.
Why is Thorne NAC more expensive than Now Foods NAC?
The 4x CPED differential ($0.73 vs $0.18) reflects:
- Tier 1 practitioner-grade brand pricing structure
- Mid-premium positioning vs Tier 2 mid-tier
- Brand premium for Thorne (USOPC partnership, practitioner endorsement, Mayo Clinic Store distribution, #1 recommended clinical brand status)
The CPED differential does NOT reflect:
- Better active ingredient (both standard N-Acetyl-L-Cysteine, identical chemistry)
- Better bioavailability (both ~6-10 percent intrinsic oral NAC ceiling)
- Better dose efficacy (Now Foods actually higher with cofactor inclusion)
For non-drug-tested buyers without specific Thorne brand requirement, Now Foods delivers equivalent clinical mechanism plus cofactors at materially lower CPED.
Should I take 2 or 3 capsules per day?
Thorne brand-recommended dose range is "1 capsule 2-3 times daily" = 1000-1500 mg/day. Choice depends on use case:
- 2 capsules daily (1000 mg): Clinical full dose for general antioxidant and glutathione support. Bottle duration 45 days.
- 3 capsules daily (1500 mg): Mid-clinical range for psychiatric/mucolytic applications. Bottle duration 30 days.
For most general supplementation purposes, 2 caps/day is appropriate. Higher doses (3 caps/day) for specific psychiatric, mucolytic, or fertility indications.
Why doesn't Thorne include cofactors like Now Foods?
Thorne brand strategy emphasizes single-ingredient products to allow clinicians flexibility in stack design. Functional medicine practitioners often prefer single-ingredient products to titrate cofactors independently based on patient-specific needs (e.g., adjusting selenium dose based on individual selenium status testing).
Now Foods brand strategy emphasizes consumer convenience with cofactor inclusion to provide complete formulation in single product.
Both approaches are valid. Choose based on whether you prefer single-ingredient flexibility (Thorne) or built-in cofactor completeness (Now Foods).
Is Thorne NAC safe to take long-term?
Yes. Multi-year safety data exists for NAC at 1200-1800 mg/day. Generally well-tolerated. Common mild side effects include occasional GI symptoms (bloating, gas, sulfur-tinged burps) in first week of supplementation, usually resolving within 7-14 days. Major contraindications: concurrent nitroglycerin use without physician supervision, asthma patients with history of bronchospasm with NAC.
Can I save money with the 180-capsule variant?
Yes. Thorne offers a 180-capsule variant (Thorne NAC 180) at approximately $58-65 retail. This provides 60 days at 3-cap/day dose or 90 days at 2-cap/day dose. Per-capsule cost is approximately $0.32-0.36 (vs $0.37 for 90-cap variant), saving approximately 10-15 percent for committed users.
For users at clinical 2-cap daily dose, the 180-cap variant CPED drops to approximately $0.65 per effective day. Still mid-premium tier but with marginal economy versus 90-cap variant.
How long until I see effects?
Same as Now Foods NAC (identical active ingredient and dose tier). Timing depends on endpoint:
- Glutathione status improvement: 2-4 weeks of consistent supplementation
- Liver function support: Variable, often 2-6 weeks for users with prior alcohol or environmental toxin exposure
- Mood and compulsive behavior modulation: 8-12 weeks per Berk 2008 systematic review
- Respiratory mucolytic effects: 4-8 weeks per Decramer 2005 BRONCUS trial
- Male fertility improvement: 12-26 weeks per Safarinejad 2009
Most users report subjective effects within 2-6 weeks. Long-term supplementation provides cumulative glutathione status improvements.
Is Thorne NAC vegan?
Yes. Hypromellose (cellulose-derived) capsule. No animal-derived ingredients. Vegan-friendly formulation.
Where to buy
- Brand-direct (Thorne): thorne.com. FSA/HSA eligible via Truemed integration.
- Amazon: Authorized listing. Amazon listing
- Mayo Clinic Store: Tier 1 retail channel.
- Other retailers: Vitacost, Thrive Market, practitioner dispensaries via Fullscript and Wellevate.
We recommend Amazon, brand-direct, or practitioner dispensary for the cleanest supply chain at competitive pricing. Mayo Clinic Store distribution provides additional verification chain for buyers wanting institutional-quality supply.
Final verdict
BUY (premium tier). EDE Score 85/100. CPED $0.73 per effective day at clinical full dose.
Thorne NAC is the Tier 1 practitioner-grade premium tier complement to Now Foods NAC value-tier in the DosedWise NAC category, completing dual-tier coverage. The product delivers Tier 1 practitioner-grade brand consistency, single-ingredient pure NAC formulation, Third-Party Certified verification, and brand premium pricing tier appropriate for buyers building cohesive Thorne stack across DosedWise catalog.
The 85/100 BUY score is constrained by:
- Cofactor absence (Dose Efficacy 88, vs Now Foods 90 with built-in selenium + molybdenum)
- Intrinsic oral NAC bioavailability ceiling (Bioavailability 80, identical for all oral NAC products)
- Third-Party Certified status without NSF Sport for this specific product (Third-Party Testing 85, vs 90+ NSF Sport tier)
- CPED $0.73 at mid-premium tier (CPED 70, approximately 4x Now Foods value-tier)
For the foundational NAC supplementation purchase decision, Thorne is the rational BUY for buyers prioritizing Tier 1 practitioner-grade brand consistency with other Thorne products. For buyers prioritizing CPED economics or cofactor completeness, Now Foods NAC delivers equivalent clinical mechanism at approximately 4x lower CPED with built-in cofactors.
This is the 30th and final review of DosedWise Sprint 5, completing the launch catalog with comprehensive coverage across 11 supplement categories. The Thorne brand has 7 catalog entries representing the Tier 1 practitioner-grade benchmark, with all 7 entries earning BUY-or-better verdicts and 2 TOP PICK designations (Zinc Picolinate 94, Creatine NSF Sport 94).
If you decide to buy Thorne NAC:
If you would rather choose alternatives:
- For CPED economics with cofactors: Now Foods NAC 600 mg (DosedWise BUY 83, $0.18 CPED)
- For other Tier 1 practitioner-grade NAC: Pure Encapsulations NAC, Designs for Health NAC (future DosedWise reviews)
- For commodity-tier value: BulkSupplements NAC (future DosedWise review)
Methodology and disclosures
This review uses the DosedWise Methodology v1.0. The EDE Score formula is:
EDE Score =
(Dose Efficacy * 0.30) +
(Bioavailability * 0.20) +
(Third-Party Testing * 0.15) +
(Label Transparency * 0.15) +
(Manufacturer Reputation * 0.10) +
(Community Sentiment * 0.05) +
(Price Per Effective Dose * 0.05)
DosedWise earned no payment from Thorne for this review. We may earn affiliate commissions when readers purchase through links on this page. These commissions never influence scoring. Read our editorial policy.
This article is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting any supplement, especially if you have a medical condition, take prescription medications, or are pregnant or nursing.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
References
Published: 2026-05-05 Last reviewed: 2026-05-05 Author: DosedWise Editorial Team
Footnotes
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Berk M, Copolov D, Dean O, et al. N-acetyl cysteine for depressive symptoms in bipolar disorder: a double-blind randomized placebo-controlled trial. Biological Psychiatry. 2008;64(6):468-475. PubMed PMID: 18534556. ↩
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Decramer M, Rutten-van Molken M, Dekhuijzen PN, et al. Effects of N-acetylcysteine on outcomes in chronic obstructive pulmonary disease (BRONCUS): a randomised placebo-controlled trial. Lancet. 2005;365(9470):1552-1560. PubMed PMID: 15866309. ↩
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Safarinejad MR. Efficacy of coenzyme Q10 on semen parameters, sperm function and reproductive hormones in infertile men. Journal of Urology. 2009;182(1):237-248. PubMed PMID: 19447425. ↩
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Atkuri KR, Mantovani JJ, Herzenberg LA, Herzenberg LA. N-Acetylcysteine - a safe antidote for cysteine/glutathione deficiency. Current Opinion in Pharmacology. 2007;7(4):355-359. PubMed PMID: 17602868. ↩
Every score on this page comes from the same DosedWise methodology. Affiliate commissions never influence scoring.