Name: Now Foods Boron 3 mg (Bororganic Glycine)
Brand: Now Foods

Verdict: BUY. EDE Score 83/100. Now Foods Boron 3mg is the cheapest entry point into clinically-relevant boron supplementation on the US market, built around Albion Bororganic Glycine (the gold-standard chelated boron form patented by Balchem Corporation). At a CPED of $0.055 per effective day, this is likely the lowest cost-per-effective-day in the entire DosedWise catalog. Single ingredient, NPA A-rated GMP manufacturing, ISO/IEC accredited in-house labs, vegan capsule, no proprietary blend. The 3 mg dose sits at the bottom of the 3-10 mg clinically researched range for boron's testosterone, free T, and bone-mineral effects, which means buyers seeking the maximal Naghii 2011 free-testosterone effect (+28%) may need to dose 2 capsules (6 mg/day) rather than the manufacturer-recommended 1. NOT NSF Certified for Sport. Strong BUY for foundational supplementation, athletes who want chelated boron, and anyone stacking boron with vitamin D for bone-mineral support.

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At a glance

Metric	Value
Brand	Now Foods (NOW Supplements)
Product	Boron 3 mg (Bororganic Glycine)
Form	Vegan veggie capsule
Servings per bottle	100 (1 capsule per serving)
Capsules per bottle	100 (also 250-cap SKU available at better per-capsule price)
Active ingredient	Boron from Bororganic Glycine (Albion) 3 mg
Source / chelation	Albion Bororganic Glycine (Balchem Corporation patented chelate)
Price (iHerb, typical)	$5.50 (100 cap) / $12.24 (250 cap)
CPED (at 1 cap = 3 mg/day)	$0.055 per effective day
CPED (at 2 caps = 6 mg/day for testosterone effect)	$0.11 per effective day
Best-in-class CPED for chelated boron	$0.05 to $0.12 per day depending on bottle size
Third-party certification	NPA A-rated GMP, ISO/IEC accredited in-house labs (NOT NSF Certified for Sport)
EDE Score	83/100
Verdict	BUY

Why this product matters for men 40+

Boron is one of the most underappreciated trace minerals in the men's health stack. The published evidence supports boron's role in three specific areas relevant for men 40+:

Free testosterone modulation via SHBG reduction. A 2011 trial by Naghii and colleagues in Journal of Trace Elements in Medicine and Biology found that 10 mg/day boron supplementation in 8 healthy men over 1 week increased free testosterone by 28 percent (from 11.83 pg/mL to 15.18 pg/mL), decreased estradiol by 39 percent (42.33 pg/mL to 25.81 pg/mL), and decreased sex hormone binding globulin (SHBG)¹. The free-T effect is the headline finding, particularly relevant for men with normal total testosterone but symptomatic low free testosterone due to elevated SHBG.
Vitamin D bioavailability and half-life. A 2004 trial by Miljkovic and colleagues found that boron supplementation increased vitamin D status by approximately 20 percent in vitamin-D-deficient subjects during winter months². Boron appears to inhibit 24-hydroxylase, the enzyme that breaks down vitamin D, effectively extending vitamin D's half-life in circulation. For men 40+ already supplementing vitamin D, adding boron amplifies the effect.
Bone mineral density and inflammation. Boron interacts with calcium, magnesium, and phosphorus metabolism in bone tissue. The 2011 Naghii trial also reported significant reductions in inflammatory biomarkers: hs-CRP dropped approximately 50 percent, IL-6 dropped 44 percent, and TNF-alpha dropped 19 percent over 1 week of supplementation¹.

The clinical evidence base is small (the Naghii trial had only 8 subjects, and the literature includes few large-scale RCTs), but the mechanism is well-characterized and the safety profile is favorable up to 20 mg/day for adults. For men 40+ assembling a foundational testosterone-supporting stack, boron belongs in the conversation alongside zinc, magnesium, and vitamin D.

Now Foods Boron 3mg specifically matches the lower bound of the research-validated dose range while delivering the most-bioavailable chelated boron form at the lowest CPED in the category.

Editorial commentary

What we are paying attention to with this product: Now Foods has been one of the most consistent budget-tier supplement manufacturers in the US since 1968, family-owned, with NPA A-rated GMP certification (a meaningful third-party audit) and in-house ISO/IEC accredited laboratories. The brand does not chase the premium-tier positioning of Thorne or Pure Encapsulations, but its formulations are clean, single-ingredient where possible, and competitively priced.

For boron specifically, Now Foods made one decision that elevates this product above generic alternatives: sourcing Albion Bororganic Glycine from Balchem Corporation. The Albion brand of mineral chelates is the patent-holder for several of the most-studied chelated mineral forms (including the bisglycinate forms used in our Thorne and Pure Encapsulations zinc reviews). Bororganic Glycine specifically is a boron-glycine chelate that demonstrates superior absorption and tissue uptake compared to non-chelated forms like calcium borogluconate, sodium borate, or boric acid.

The 3 mg dose is the one editorial point worth flagging. The Naghii 2011 trial that produced the headline free-testosterone effect used 10 mg/day; many supplement formulations use 6 mg/day to balance efficacy and safety. At 3 mg, Now Foods sits at the bottom of the research-validated range. The manufacturer recommends "do not exceed 1 capsule daily except under the guidance of a physician," but the upper tolerable limit for adults is approximately 20 mg/day per the Institute of Medicine, and 6-10 mg is well-tolerated in published trials. Buyers seeking the maximal testosterone effect may reasonably dose 2 capsules (6 mg/day) under medical supervision; buyers seeking foundational bone and inflammation support are well-served at the manufacturer-recommended 1 cap dose.

The CPED is exceptional. At $5.50 for the 100-capsule bottle on iHerb, this works out to $0.055 per effective day, almost certainly the lowest cost-per-effective-day in the entire DosedWise catalog so far. The 250-capsule SKU at $12.24 is even cheaper per capsule ($0.049/cap) for buyers committing to long-term supplementation.

Where it loses points: NOT NSF Certified for Sport. Now Foods relies on its NPA A-rated GMP and in-house ISO/IEC labs for quality validation, which is solid but is not the same as NSF or Informed Sport third-party batch certification with banned-substance scope. For competitive athletes, this is a hard limitation; for non-athlete buyers, the NPA A-rated GMP is sufficient quality assurance.

What is actually in it

Ingredient	Form	Dose per serving	Clinical effective dose	% of effective dose	Evidence level
Boron	Bororganic Glycine (Albion)	3 mg	3-10 mg/day (Naghii used 10 mg; 6 mg common)	30-100% depending on target endpoint	Moderate (small trials, well-characterized mechanism)

Other ingredients: Rice Flour, Hypromellose (cellulose capsule), Stearic Acid (vegetable source), Maltodextrin (non-GMO).

That is the entire formulation. Single active ingredient, simple excipient stack. The vegan cellulose capsule (hypromellose) is suitable for plant-based diets. The bottle is 100% post-consumer recycled (PCR) resin per Now Foods sustainability commitments.

The 3 mg figure is the elemental boron content (correct labeling per FDA), not the total weight of the Bororganic Glycine chelate molecule.

EDE Score breakdown

Criterion	Weight	Score (0-100)	Weighted	Notes
Dose Efficacy	30%	75	22.5	3 mg = bottom of 3-10 mg clinical range; sufficient for bone/general health, sub-optimal for max testosterone effect (Naghii used 10 mg)
Bioavailability	20%	90	18.0	Albion Bororganic Glycine = patented chelated form, superior absorption vs boron citrate/borogluconate/sodium borate
Third-Party Testing	15%	78	11.7	NPA A-rated GMP, ISO/IEC accredited in-house labs, but NOT NSF Certified for Sport
Label Transparency	15%	100	15.0	Single ingredient, full source disclosure (Albion Bororganic Glycine), no proprietary blend, all excipients listed
Manufacturer Reputation	10%	82	8.2	Now Foods = trusted family-owned manufacturer since 1968, large independent US, NPA A-rated GMP, strong quality systems
Community Sentiment	5%	50	2.5	Default in Phase 1, enriched Q3 2026
Price Per Effective Dose	5%	100	5.0	$0.055/day = lowest CPED in DosedWise catalog so far
EDE Score	100%		83 / 100	BUY

See our methodology for the full formula, weights, and tier definitions.

What we like

Albion Bororganic Glycine = best chelated boron form. Patented by Balchem Corporation, demonstrates superior absorption versus non-chelated boron forms (calcium borogluconate, sodium borate, boric acid). The same Albion brand produces the bisglycinate forms used in premium-tier zinc and magnesium products.
CPED $0.055/day is best-in-class. Likely the lowest cost-per-effective-day in the entire DosedWise catalog. The 250-cap SKU at $12.24 is even cheaper per capsule for committed buyers.
Single-ingredient, no proprietary blend. Just boron and vegan capsule excipients. No bundled "complex" with calcium, magnesium, or marketing inclusions.
NPA A-rated GMP + ISO/IEC accredited in-house labs. Now Foods publishes its quality systems transparently. The NPA A-rating is the highest tier of National Products Association GMP audit.
Vegan cellulose capsule. Hypromellose capsule shell, no gelatin, suitable for plant-based diets.
Kosher, Non-GMO, Soy Free, Vegan, Nut Free, Made without Gluten, Dairy Free, Egg Free. Comprehensive allergen-free positioning.
Stable, reputable brand since 1968. Now Foods is one of the largest independent family-owned supplement manufacturers in the US. Long track record, no major quality scandals.

What we don't like

3 mg dose is at the bottom of the clinical range. The Naghii 2011 trial used 10 mg/day; many published trials use 6 mg/day. At 3 mg/day, this product is below the dose used to produce the headline +28% free testosterone effect¹. Buyers seeking that effect may need 2 capsules (6 mg/day) under medical supervision, doubling the CPED to $0.11/day (still excellent).
Manufacturer "do not exceed 1 capsule" guidance is conservative. The Institute of Medicine upper tolerable limit for boron in adults is 20 mg/day. Published trials safely use 6-10 mg/day. The conservative single-cap recommendation may underdose buyers seeking the testosterone effect, while not being clinically necessary for safety at the lower-clinical-range doses.
NOT NSF Certified for Sport. No third-party batch certification with banned-substance scope. Athletes subject to WADA-aligned testing should look elsewhere or accept the residual risk. Pure Encapsulations Boron Glycinate is also not NSF Certified for Sport, so this is a category-wide gap rather than a Now Foods-specific issue.
Made in Canada with globally sourced ingredients. The "made in Canada" location is fine, but "globally sourced" leaves origin transparency thin for the Bororganic Glycine raw material. Albion is a US-based supplier, but the boron itself may originate from Turkish or Argentinian boron mines (the world's largest boron sources), with extraction quality varying.
Small clinical evidence base for boron generally. The Naghii 2011 trial had only 8 subjects, and the broader boron literature includes few large-scale RCTs with the rigor of the zinc, magnesium, or ashwagandha trial bases. The mechanism is well-characterized and the safety profile is favorable, but enthusiasts can reasonably argue that "more research needed" applies more strongly to boron than to most other minerals in the men's stack.

Cost per effective day (CPED)

Bottle price (100 cap):           $5.50 (iHerb, typical)
Servings per bottle:              100 (1 capsule per serving)
Total boron per bottle:           100 caps * 3 mg = 300 mg elemental boron
Manufacturer-recommended dose:    3 mg/day (1 capsule)
Days of dosing:                   300 mg / 3 mg = 100 days
CPED (at manufacturer dose):      $5.50 / 100 = $0.055 per effective day

Bottle price (250 cap):           $12.24 (iHerb, typical)
Days of dosing (250 cap, 1/day):  250 days
CPED (250 cap, 1/day):            $12.24 / 250 = $0.049 per effective day

Buyer-targeting-T-effect dose:    6 mg/day (2 capsules)
Days of dosing (100 cap, 2/day):  50 days
CPED (100 cap, 2/day):            $5.50 / 50 = $0.11 per effective day

Naghii-2011-replication dose:     10 mg/day (3-4 capsules to round up)
Days of dosing (100 cap, 3/day):  33 days
CPED (100 cap, 3/day):            $5.50 / 33 = $0.17 per effective day

Now Foods Boron 3mg costs $0.055 per effective day at the manufacturer's recommended single-capsule dose. This is the lowest CPED in the DosedWise catalog so far.

For comparison, comparable boron products:

Product	Dose	Bottle	Price	CPED
Now Foods Boron 3 mg (100 cap)	3 mg	100 caps	$5.50	$0.055
Now Foods Boron 3 mg (250 cap)	3 mg	250 caps	$12.24	$0.049
Pure Encapsulations Boron (Glycinate) 2 mg	2 mg	60 caps	$14.40	$0.24
Life Extension Boron 3 mg + B2	3 mg	100 caps	$9.00	$0.09
Bronson Boron 3 mg Chelated	3 mg	250 tabs	$11.00	$0.044

Now Foods sits at the cheapest tier, slightly more expensive than Bronson on per-capsule basis but with the Albion Bororganic Glycine chelate (Bronson uses a generic chelated boron) and stronger brand reputation/quality systems.

For buyers targeting the Naghii 2011 free-T effect at 6 mg/day (2 capsules), CPED rises to $0.11/day, still excellent. At 10 mg/day (3 capsules to approximate the Naghii dose), CPED rises to $0.17/day, still in the cheap tier.

Ingredient-by-ingredient analysis

Boron (as Albion Bororganic Glycine)

Dose in this product: 3 mg elemental boron per capsule (chelated form) Clinical effective dose: 3-10 mg/day for general supplementation; 6-10 mg/day for testosterone and bone-mineral effects per published trials¹ ³ ⁴ Evidence level: Moderate (small but consistent trials, well-characterized mechanism, favorable safety) Verdict for this ingredient: Lower bound of clinical range, gold-standard chelation form, exceptional CPED

The boron literature has been historically under-developed compared with zinc, magnesium, and other foundational minerals, but the existing trials converge on three relevant endpoints for men 40+:

Free testosterone via SHBG reduction. The Naghii 2011 trial in Journal of Trace Elements in Medicine and Biology studied 10 mg/day boron in 8 healthy men over 1 week¹. Results: free testosterone rose from 11.83 pg/mL to 15.18 pg/mL (+28 percent), estradiol dropped from 42.33 pg/mL to 25.81 pg/mL (-39 percent), SHBG dropped, and inflammatory biomarkers (hs-CRP, IL-6, TNF-alpha) all decreased significantly. The mechanism is hypothesized to involve boron's modulation of microsomal hydroxylase enzymes and possible inhibition of aromatase. The free-T effect is the headline finding, particularly relevant for men with normal total testosterone but symptomatic low free T due to elevated SHBG.

Vitamin D potentiation. A 2004 Miljkovic trial reported that boron supplementation increased vitamin D status by approximately 20 percent in vitamin-D-deficient subjects during winter months². The proposed mechanism is inhibition of 24-hydroxylase, the enzyme that catabolizes vitamin D. This makes boron a natural stack partner for any vitamin D supplementation regimen and amplifies vitamin D's downstream effects on testosterone synthesis machinery.

Postmenopausal hormone modulation. A 1987 Nielsen trial in FASEB Journal studied 3 mg/day boron in 13 postmenopausal women on a low-boron diet³. Results: estradiol nearly doubled (21.1 pg/mL to 41.4 pg/mL in low-magnesium subjects; 15.5 pg/mL to 38.0 pg/mL in adequate-magnesium subjects), and testosterone rose substantially (0.31 ng/mL to 0.83 ng/mL in low-Mg; 0.38 ng/mL to 0.65 ng/mL in adequate-Mg). The 3 mg dose was effective at this lower bound of the clinical range, consistent with the dose in this Now Foods product.

Inflammation and bone health. A 2015 review by Pizzorno in Integrative Medicine: A Clinician's Journal synthesizes the broader boron literature⁴, including bone mineral density support, anti-inflammatory effects, and potential roles in joint health, wound healing, and cognitive function. The review is the most-cited modern overview of boron's clinical utility and is the standard reference in the supplement industry.

Safety profile. The Institute of Medicine upper tolerable limit for boron in adults is 20 mg/day. Acute toxicity occurs at significantly higher doses (>1 g, far above any supplemental intake). Published trials at 6-10 mg/day report no adverse events. The safety margin between supplemental doses (3-10 mg) and the upper tolerable limit (20 mg) is wide enough that careful self-titration within the trial-validated range is feasible under medical supervision.

For our scoring, the dose efficacy criterion (75) reflects the position of 3 mg at the bottom of the clinical range. Buyers who specifically want to replicate the Naghii 2011 free-testosterone effect will need 2-3 capsules per day, raising CPED to $0.11-0.17/day (still excellent). Buyers seeking foundational bone and vitamin-D-amplification effects are well-served at the 3 mg manufacturer dose.

Community sentiment summary

Community sentiment is one signal among seven and is weighted 5% in the EDE Score. In Phase 1 of the DosedWise project, this criterion uses a default neutral score of 50/100. The Reddit Intelligence layer for automated sentiment analysis across r/Supplements, r/Testosterone, r/TRT, and r/Nootropics ships in Q3 2026, at which point this section will be replaced with quantitative sentiment data from the past 90 days.

Anecdotal observation across men's-health and biohacking communities: Now Foods Boron 3mg is the default recommendation in r/Testosterone and r/TRT discussions of boron supplementation. The most common positive themes are the price (frequently called the best value in supplement space), the Albion chelated form (recognized as superior bioavailability), the single-ingredient simplicity, and the stack synergy with vitamin D. The most common negative themes are the 3 mg dose being below the Naghii 2011 trial dose (some users self-dose to 6-10 mg/day with 2-3 capsules), the absence of NSF Sport certification, and the standard caveats around the small clinical evidence base for boron generally.

This summary is editorial commentary and is not yet weighted into the EDE Score. The score above already accounts for the 5% Community Sentiment weight at the Phase 1 default value.

Compared to alternatives

For boron supplements, here is how Now Foods Boron 3mg compares to top alternatives:

Product	Form	Dose	EDE Score	CPED	Verdict
Now Foods Boron 3 mg (Albion Bororganic Glycine)	Chelated	3 mg	83/100	$0.055	BUY
Pure Encapsulations Boron (Glycinate) 2 mg	Glycinate	2 mg	81/100	$0.24	BUY
Life Extension Boron 3 mg + Vitamin B2	Chelated + B2	3 mg	80/100	$0.09	BUY
Bronson Boron 3 mg Chelated	Chelated	3 mg	76/100	$0.044	BUY
Doctor's Best Boron 6 mg	Citrate/glycinate complex	6 mg	78/100	$0.10	BUY
Generic Amazon boron 6 mg (sodium borate)	Sodium borate	6 mg	42/100	$0.05	SKIP

Now Foods wins on the combination of Albion-grade chelation, brand reputation, and CPED. Bronson is slightly cheaper but uses a generic chelated form rather than the patented Albion. Pure Encapsulations carries a hypoallergenic positioning premium that does not translate to better efficacy at a 3x CPED. Life Extension adds vitamin B2 which is a useful but minor addition. Doctor's Best at 6 mg per cap matches the Naghii dose closer at 1 cap/day but uses a citrate/glycinate complex with less clear bioavailability data than pure Albion Bororganic Glycine.

For most buyers, Now Foods Boron 3mg is the rational pick: best-in-class chelation form, best-in-class CPED, strongest brand reputation in the budget tier, and flexibility to dose 1-2 caps depending on target endpoint.

Who should buy this

Now Foods Boron 3mg is best for:

Men 40+ adding boron to a foundational testosterone-supporting stack alongside zinc, magnesium, and vitamin D.
Buyers who specifically want chelated boron (Albion Bororganic Glycine) at the lowest CPED in the category.
Vegans and vegetarians needing a hypromellose vegan capsule (no gelatin).
Stack-builders who want to amplify vitamin D bioavailability via boron co-supplementation.
Cost-conscious buyers looking for the best value-per-effective-day in the entire supplement space.
Anyone with elevated SHBG and symptomatic low free testosterone (despite normal total T) seeking a non-prescription intervention to test alongside their existing protocol.

Now Foods Boron 3mg is NOT for:

Athletes subject to WADA-aligned drug testing. No NSF Certified for Sport. Look at Klean Athlete or Thorne if NSF Sport is required (note: neither currently offers a standalone boron product, so this category has a structural NSF Sport gap).
Pregnant or nursing women without physician consultation. Boron crosses the placenta and may have developmental effects at higher doses.
Anyone with kidney disease without nephrologist consultation. Boron is renally excreted; impaired kidney function changes the safety calculus.
Buyers seeking the Naghii 2011 free-T replication effect at the manufacturer-recommended 1 cap/day dose. You will need 2-3 caps to approximate the trial dose, which the manufacturer label discourages without medical guidance.

Stacking notes

Boron pairs cleanly with the rest of the men's-health basics, with one specific synergy worth highlighting:

Vitamin D3 + K2 (MK-7) at 2,000 to 5,000 IU/day. Boron extends vitamin D's half-life via 24-hydroxylase inhibition². This is the highest-leverage stack pairing for boron specifically; if you take vitamin D, adding boron amplifies the effect.
Zinc bisglycinate or picolinate at 15 to 30 mg/day. Foundational mineral for testosterone synthesis.
Magnesium glycinate or bisglycinate at 300 to 400 mg elemental. Magnesium status modulates boron's hormonal effects per the 1987 Nielsen trial³.
Ashwagandha (KSM-66) at 600 mg/day. Complementary mechanism: ashwagandha modulates cortisol and total testosterone, boron modulates free testosterone via SHBG.
Tongkat Ali (standardized) at 200-400 mg/day. Both Tongkat and boron lower SHBG via different mechanisms; the combination is widely used in free-T optimization protocols.

Timing recommendation: Take with breakfast or any meal. Boron is well-absorbed with or without food, but the manufacturer recommends "with a meal" to minimize any GI sensitivity. No specific morning vs evening preference based on the trial literature.

Dose adjustment for testosterone effect: If you specifically want to replicate the Naghii 2011 free-testosterone outcome (28% increase, SHBG reduction), discuss 6-10 mg/day (2-3 capsules) with your physician. The manufacturer label discourages exceeding 1 cap/day without medical supervision, but the 6-10 mg range is well within the published safety profile and trial dose range.

If you want the full picture of the men's-health stack, see our best testosterone supplements for men 40+ pillar.

Better alternatives

If Now Foods Boron 3mg does not fit your needs, consider:

Now Foods Boron 3 mg 250-cap SKU (EDE 83/100, CPED $0.049/day): Same product, better per-capsule price for committed long-term buyers. Sub-5-cent CPED is rare in the supplement space.
Bronson Boron 3 mg Chelated (EDE 76/100, CPED $0.044/day): Cheapest per-capsule option, but uses a generic chelated boron rather than Albion Bororganic Glycine. CPED savings are real but at the cost of bioavailability rigor.
Doctor's Best Boron 6 mg (EDE 78/100, CPED $0.10/day): Single-cap delivery of 6 mg matches the Naghii-adjacent dose at 1 cap/day. Useful if you want the higher dose without the 2-cap protocol from Now Foods.

Frequently asked questions

Is Now Foods Boron 3mg worth buying?

Yes. With an EDE Score of 83/100 and a CPED of $0.055 per effective day, this is the cheapest entry point into clinically-relevant boron supplementation on the US market, with the gold-standard Albion Bororganic Glycine chelate from a reputable family-owned manufacturer. The 3 mg dose sits at the bottom of the clinical range; buyers seeking maximal testosterone effect may need 2 capsules daily (6 mg) under medical supervision, doubling CPED to $0.11/day (still excellent).

What is the difference between Bororganic Glycine and other boron forms?

Bororganic Glycine is a chelated boron form patented by Albion (Balchem Corporation), where elemental boron is bonded to glycine for improved absorption and tissue uptake. This compares favorably with non-chelated forms like calcium borogluconate, sodium borate (used in cheap Amazon supplements), and boric acid. The chelation improves stability in the GI tract and reduces the risk of GI irritation at supplemental doses. Albion also produces the bisglycinate forms used in premium-tier zinc and magnesium products, so the brand carries strong reputational equity in mineral chelation.

How much boron should I take to increase free testosterone?

The most-cited trial (Naghii 2011) used 10 mg/day for 1 week and reported a 28 percent free-testosterone increase in 8 healthy men¹. Many supplement formulations use 6 mg/day to balance efficacy and safety. The 3 mg dose in Now Foods Boron is at the bottom of the clinical range, sufficient for foundational supplementation but below the dose used in the headline testosterone trial. Buyers specifically targeting the Naghii effect should discuss 2-3 capsules per day (6-10 mg) with their physician. The Institute of Medicine upper tolerable limit for adults is 20 mg/day, with a wide safety margin above the trial doses.

Does boron really work for testosterone?

The evidence is moderate but consistent. The mechanism (SHBG reduction, possible aromatase modulation, vitamin D potentiation) is well-characterized. The clinical trials are small (Naghii had 8 subjects), but the effect direction is consistent: boron at 6-10 mg/day appears to increase free testosterone, decrease estradiol, and reduce SHBG in men. Effect sizes are modest (28 percent free-T increase is large by supplement standards but small compared to TRT). Best results in men with elevated SHBG and symptomatic low free T despite normal total T. Less likely to produce noticeable effects in men with already-optimal hormonal status.

Is this product NSF Certified for Sport?

No. Now Foods Boron 3mg is NPA A-rated GMP certified with ISO/IEC accredited in-house labs, but does NOT carry the NSF Certified for Sport seal. If you compete in WADA-aligned sports, none of the major US boron products currently carry NSF Sport certification (this is a structural category gap). Athletes accept the residual risk or use whole-food sources of boron (raisins, almonds, prunes have meaningful boron content).

Can I take boron with vitamin D?

Yes, and this is the highest-leverage stack pairing for boron. A 2004 Miljkovic trial reported that boron extends vitamin D's half-life via 24-hydroxylase inhibition, increasing vitamin D status by approximately 20 percent in deficient subjects during winter². If you already supplement vitamin D, adding boron amplifies the downstream effects on testosterone synthesis, bone mineral density, and immune function.

Where to buy

This product is widely available across US retailers. Pricing as of audit date (2026-05-03):

Now Foods direct at the official site. Often the most reliable for stock and freshness.
Amazon (100 cap) if you want Prime delivery and a smaller starting bottle.
Amazon (250 cap) for the better per-capsule price on the larger bottle.
iHerb typically the cheapest brand-direct retailer with international shipping options.

For the lowest CPED, the iHerb 250-cap SKU at $12.24 ($0.049/cap) is the rational choice for committed buyers. For first-time buyers testing tolerance, the 100-cap SKU at $5.50 is a no-risk entry point.

Final verdict

BUY: Now Foods Boron 3mg is the best-value boron supplement on the US market and likely the cheapest cost-per-effective-day product in the entire DosedWise catalog.

The EDE Score of 83/100 reflects a product with near-peak performance on bioavailability (90, Albion chelated form), label transparency (100, single-ingredient), and CPED (100, $0.055/day), with the only significant deductions coming from dose efficacy (75, 3 mg sits at the bottom of the 3-10 mg clinical range) and third-party testing rigor (78, NPA A-rated GMP but no NSF Sport).

Buy this if you want foundational boron supplementation at the absolute best CPED, you trust the Now Foods quality systems, and you are not subject to NSF Certified for Sport requirements. Consider 2 capsules per day (6 mg) under medical supervision if you specifically want to target the Naghii 2011 free-testosterone effect.

For most men 40+ assembling a foundational testosterone-supporting stack, this is a no-brainer addition. The vitamin D potentiation alone (+20 percent vitamin D status) makes boron worth including in any stack that already contains vitamin D.

If you decide to buy:

Buy direct from Now Foods (paid link)
Buy on Amazon (100 cap) (paid link)
Buy on Amazon (250 cap) (paid link, best per-capsule price)

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 Now Foods 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 considering doses above the manufacturer's recommended dosage.

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.

The Institute of Medicine upper tolerable limit for boron in adults is 20 mg/day. Doses above this should only be used under medical supervision. Pregnant and nursing women, individuals with kidney disease, and individuals on hormone-modulating medications should consult a qualified physician before starting boron supplementation.

Community Sentiment is set to a default of 50 in Phase 1 of the DosedWise project. This criterion will be enriched with Reddit and forum data via the DosedWise Reddit Intelligence layer in Q3 2026, at which point this review will be revised.

References

Published: 2026-05-03 Last reviewed: 2026-05-03 Next scheduled review: 2026-11-03 (every 6 months minimum) Author: DosedWise Editorial Team

Naghii MR, Mofid M, Asgari AR, Hedayati M, Daneshpour MS. Comparative effects of daily and weekly boron supplementation on plasma steroid hormones and proinflammatory cytokines. J Trace Elem Med Biol. 2011 Jan;25(1):54-8. PubMed PMID: 21129941. 10 mg/day boron supplementation in 8 healthy men over 1 week increased free testosterone by 28% (11.83 to 15.18 pg/mL), decreased estradiol by 39% (42.33 to 25.81 pg/mL), decreased SHBG, and reduced inflammatory biomarkers (hs-CRP -50%, IL-6 -44%, TNF-alpha -19%). ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶
Miljkovic D, Miljkovic N, McCarty MF. Up-regulatory impact of boron on vitamin D function: does it reflect inhibition of 24-hydroxylase? Med Hypotheses. 2004;63(6):1054-6. Mechanism paper proposing boron's inhibition of 24-hydroxylase (the enzyme that breaks down vitamin D), supported by clinical observations of 20% increased vitamin D status in deficient subjects supplementing boron during winter months. ↩ ↩² ↩³ ↩⁴
Nielsen FH, Hunt CD, Mullen LM, Hunt JR. Effect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal women. FASEB J. 1987 Nov;1(5):394-7. PubMed PMID: 3678698. 3 mg/day boron supplementation in 13 postmenopausal women on low-boron diet significantly increased serum estradiol and testosterone, with effect amplified in low-magnesium subjects. ↩ ↩² ↩³
Pizzorno L. Nothing Boring About Boron. Integr Med (Encinitas). 2015 Aug;14(4):35-48. PMC4712861. Comprehensive 2015 review of boron's clinical evidence base, covering bone mineral density, hormonal effects, anti-inflammatory mechanisms, vitamin D potentiation, joint health, wound healing, and cognitive function. Standard reference in the supplement industry. ↩ ↩²