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Boron
Boron is a trace mineral with one famous testosterone trial and a longer trail of older bone and inflammation work, none of which is conclusive.
- Evidence
- Weak Evidence
- Category
- Vitamins & Minerals
- Best form
- Boron citrate (well-absorbed, low cost)
- Effective dose
- 3-10 mg/day. Bone and general support typically uses 3-6 mg/day
- Lab tested
- 4 of 9 products
- Category
- Vitamins & Minerals
- Best form
- Boron citrate (well-absorbed, low cost)
- Effective dose
- 3-10 mg/day. Bone and general support typically uses 3-6 mg/day
- Lab tested
- 4 of 9 products
Key takeaways
- →Bone and joint support at 3 to 6 mg per day is the most defensible use; the testosterone hype rests on one trial in 8 men.
- →Calcium fructoborate (Fruitex-B) has the cleanest joint and inflammation data; boron citrate or glycinate is the cheapest practical form.
- →FDA Tolerable Upper Intake Level is 20 mg per day for adults; above that you risk GI symptoms and dermatitis.
- →Avoid in pregnancy, estrogen-sensitive cancers, and on hormone replacement therapy without medical sign off.
What Is Boron?
Boron is a trace mineral with one famous testosterone trial and a longer trail of older bone and inflammation work, none of which is conclusive. The viral "boron raises testosterone" claim traces to a single 2011 study by Naghii in 8 men taking 10 mg/day for 7 days, which reported a 28% rise in free testosterone and a drop in estradiol and inflammatory markers. One small short trial does not establish a benefit pattern, especially for a hormonal endpoint where placebo response and assay variability are high. Larger trials in athletes and bodybuilders have not replicated meaningful testosterone gains.
The bone story is older and mostly observational. Nielsen's 1987 metabolic ward work in 12 postmenopausal women found 3 mg/day of boron reduced urinary calcium and magnesium loss and raised serum estradiol, especially when dietary magnesium was low. That is a useful mechanistic signal but not a fracture-prevention outcome, and it has not been followed by a large bone density RCT.
The most consistent recent data is on calcium fructoborate, the patented Fruitex-B form. A 2014 trial by Pietrzkowski in 60 adults with knee discomfort showed meaningful WOMAC and McGill pain score improvements at 110 mg twice daily over two weeks. Earlier work by Scorei and colleagues in osteoarthritis subjects showed reductions in hsCRP and other inflammation markers. The studies are small and largely from one research group, so they are best read as early signal rather than confirmed benefit.
The Mahabir 2008 analysis in over 1,500 women found higher dietary boron was associated with lower lung cancer risk, with the protective signal strongest in women not on hormone replacement therapy. This is observational and tells you nothing about causation, but it is one reason boron is treated as a hormonally active nutrient rather than a neutral mineral. Practical takeaway: 3 to 6 mg per day from a clean citrate or glycinate is a reasonable bet for bone and joint support, do not take it for testosterone, and stay well below the 20 mg UL.
Does It Work? The Evidence
How A-F grades workFree testosterone elevation in men
Naghii et al. 2011 (n=8 men, 10 mg/day x 7 days): free testosterone rose ~28%, estradiol and hsCRP fell. Single small short trial, not replicated in larger work.
Bone mineralization and calcium retention
Nielsen et al. 1987 (n=12 postmenopausal women, 3 mg/day): reduced urinary calcium and magnesium excretion, raised serum 17-beta-estradiol. Mechanistic signal, no fracture or BMD endpoint trial.
Knee osteoarthritis pain (calcium fructoborate)
Pietrzkowski et al. 2014 (n=60, 110 mg calcium fructoborate twice daily x 14 days): significant WOMAC and McGill pain reductions vs placebo.
Inflammation markers (hsCRP, TNF-alpha)
Scorei et al. 2011 pilot in primary osteoarthritis subjects: calcium fructoborate reduced inflammatory markers vs placebo. Naghii 2011 also reported drops in hsCRP, IL-6, TNF-alpha.
Cancer risk reduction
Mahabir et al. 2008 case-control: higher dietary boron inversely associated with lung cancer risk in women, especially without HRT. Observational only, no intervention data.
| Grade | Claimed Benefit | Key Studies | Our Verdict |
|---|---|---|---|
| C | Free testosterone elevation in men | Naghii et al. 2011 (n=8 men, 10 mg/day x 7 days): free testosterone rose ~28%, estradiol and hsCRP fell. Single small short trial, not replicated in larger work. | Early Signal |
| C | Bone mineralization and calcium retention | Nielsen et al. 1987 (n=12 postmenopausal women, 3 mg/day): reduced urinary calcium and magnesium excretion, raised serum 17-beta-estradiol. Mechanistic signal, no fracture or BMD endpoint trial. | Early Signal |
| C | Knee osteoarthritis pain (calcium fructoborate) | Pietrzkowski et al. 2014 (n=60, 110 mg calcium fructoborate twice daily x 14 days): significant WOMAC and McGill pain reductions vs placebo. | Early Signal |
| C | Inflammation markers (hsCRP, TNF-alpha) | Scorei et al. 2011 pilot in primary osteoarthritis subjects: calcium fructoborate reduced inflammatory markers vs placebo. Naghii 2011 also reported drops in hsCRP, IL-6, TNF-alpha. | Early Signal |
| D | Cancer risk reduction | Mahabir et al. 2008 case-control: higher dietary boron inversely associated with lung cancer risk in women, especially without HRT. Observational only, no intervention data. | Not There Yet |
How to Choose: Forms, Doses & What Matters
Clinical dose: 3-10 mg/day. Bone and general support typically uses 3-6 mg/day; the testosterone trial used 10 mg/day for 7 days. FDA Tolerable Upper Intake Level is 20 mg/day for adults.
Best forms: Boron citrate (well-absorbed, low cost), Boron glycinate / bororganic glycine (Albion Bororganic Glycine), Calcium fructoborate (Fruitex-B, the form used in osteoarthritis trials)
Take 3 to 6 mg per day with a meal to minimize any GI effects. For joint discomfort, calcium fructoborate at 110 mg twice daily (delivering about 3 mg elemental boron per dose) matches the trial protocol. Boron is fat-soluble enough that timing with food helps; consistency over weeks matters more than time of day. Audit your other supplements first: many bone, multivitamin, and mens-health formulas already include 1 to 3 mg of boron, so a standalone capsule may double your intake.
Who Should Take Boron?
Postmenopausal women looking for low-risk bone metabolism support. Older adults with osteoarthritis or joint discomfort, particularly with calcium fructoborate. People on whole-foods diets low in fruits and nuts where boron intake may be under 1 mg per day. Men curious about a trace mineral piece of a broader testosterone-supportive routine, with realistic expectations.
Who Should Avoid It?
Not for everyone
Side Effects & Safety
Product Scores
9 products scored on dosing accuracy, third-party testing, cost per effective dose, and label transparency.
The Scorecard: 9 Products Compared
Boron 3 mg (Bororganic Glycine)
NOW Foods$7.99 ÷ 100 days at 3mg/day (1 serving × 3mg)
NOW runs its own analytical lab and publishes COAs on request, which is unusual at this price
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron Picolinate 3 mg
Thorne$17.99 ÷ 60 days at 3mg/day (1 serving × 3mg)
Thorne is the option for buyers who want practitioner-channel quality on every supplement, including trace minerals
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron (Glycinate) 2 mg
Pure Encapsulations$17.80 ÷ 59 days at 2mg/day (1 serving × 2mg)
The go-to option if you have multiple sensitivities or want practitioner-grade quality
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron 3 mg (Triple Boron Complex with Vitamin B2)
Life Extension$17.10 ÷ 171 days at 3mg/day (1 serving × 3mg)
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron from Albion 6 mg (Bororganic Glycine)
Swanson
$7.99 ÷ 61 days at 6mg/day (1 serving × 6mg)
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron Citrate Capsules 5 mg
BulkSupplements
$28.96 ÷ 483 days at 5mg/day (1 serving × 5mg)
Best pick if you want a long-supply, low-cost option and are willing to email for a COA
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Triple Boron 3 mg
Source Naturals
$9.99 ÷ 100 days at 3mg/day (1 serving × 3mg)
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron Citrate 3 mg
Solaray
$9.99 ÷ 59 days at 3mg/day (1 serving × 3mg)
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Boron Complex 3 mg
Nature's Way
$12.99 ÷ 100 days at 3mg/day (1 serving × 3mg)
Prices checked 2026-04-26. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Boron 3 mg (Bororganic Glycine) NOW Foods | Boron Picolinate 3 mg Thorne | Boron (Glycinate) 2 mg Pure Encapsulations | Boron 3 mg (Triple Boron Complex with Vitamin B2) Life Extension | Boron from Albion 6 mg (Bororganic Glycine) Swanson | Boron Citrate Capsules 5 mg BulkSupplements | Triple Boron 3 mg Source Naturals | Boron Citrate 3 mg Solaray | Boron Complex 3 mg Nature's Way |
|---|---|---|---|---|---|---|---|---|---|
| Brand Score | 87/100Winner | 86/100 | 84/100 | 82/100 | 80/100 | 79/100 | 78/100 | 76/100 | 75/100 |
| Dosing & Form | 23/25Winner | 23/25 | 19/25 | 23/25 | 22/25 | 22/25 | 22/25 | 22/25 | 22/25 |
| Purity | 19/25 | 24/25Winner | 22/25 | 17/25 | 17/25 | 17/25 | 15/25 | 14/25 | 14/25 |
| Value | 23/25 | 16/25 | 19/25 | 19/25 | 22/25 | 24/25Winner | 22/25 | 21/25 | 20/25 |
| Transparency | 22/25 | 23/25 | 24/25Winner | 23/25 | 19/25 | 16/25 | 19/25 | 19/25 | 19/25 |
| Cost/Day | $0.08 | $0.30 | $0.30 | $0.10 | $0.13 | $0.06Winner | $0.10 | $0.17 | $0.13 |
| Dose/Serving | 3mg | 3mg | 2mg | 3mg | 6mg | 5mg | 3mg | 3mg | 3mg |
| Form | Bororganic Glycine (boron amino acid chelate) | Boron Picolinate | Boron Glycinate (amino acid chelate) | Boron Citrate + Glycinate + Aspartate (with 25 mg riboflavin) | Bororganic Glycine (Albion patented chelate) | Boron Citrate | Boron Citrate + Aspartate + Glycinate Blend | Boron Citrate Blend (with alfalfa, parsley leaf, kelp) | Boron Amino Acid Chelate |
| Third-Party Tested | No | ✓ Yes | ✓ Yes | ✓ Yes | No | ✓ Yes | No | No | No |
| Proprietary Blend | No | No | No | No | No | No | No | No | No |
Frequently Asked Questions
Does boron actually raise testosterone?
The viral claim traces to one 2011 study in 8 healthy men who took 10 mg per day for one week and saw free testosterone rise about 28 percent. That is a small, short trial in a tiny sample. Larger studies in athletes and resistance-trained men have not replicated meaningful testosterone gains. Treat boron as a possible minor contributor at best, not a testosterone booster.
What form of boron should I take?
For general bone or hormone support, boron citrate or boron glycinate (also called bororganic glycine, often the Albion form) at 3 to 6 mg per day is fine and inexpensive. For joint discomfort, calcium fructoborate (the patented Fruitex-B) has the most direct trial data. Boric acid is technically the most absorbed form but is rarely sold as a standalone supplement because of the industrial associations.
Is boron safe to take long-term?
At 3 to 6 mg per day, yes, that is well within dietary ranges and far below the FDA's 20 mg per day Tolerable Upper Intake Level for adults. Long-term safety data above 10 mg per day from supplements is thin. The bigger long-term issue is double-dipping: bone formulas, multivitamins, and mens-health stacks often already contain boron, so check labels before adding more.
How much boron is in food?
Most adults get roughly 1 to 1.5 mg per day from food. Top sources are dried fruit (raisins, prunes, dates), avocado, nuts (especially almonds and hazelnuts), legumes, and wine. A diet heavy in produce can deliver 3 mg or more without supplementation. Diets low in fruit and nuts often fall below 1 mg.
Does boron interact with calcium or magnesium supplements?
It works alongside them rather than competing. Nielsen's bone work showed boron reduces urinary calcium and magnesium loss, particularly when magnesium intake is low. Taking boron with your calcium and magnesium is reasonable. Do not assume more is better; stick to 3 to 6 mg per day combined intake from all sources.
Should women take boron?
Yes for postmenopausal bone support, with two cautions. Boron raises serum estradiol modestly, which is helpful for bone metabolism but a problem if you have a history of estrogen-sensitive cancer or are on hormone therapy. If either applies, talk to your oncologist or prescriber before starting. For premenopausal women without those concerns, 3 mg per day is a low-risk dose.
Can boron replace HRT or osteoporosis medication?
No. The Nielsen mechanistic data and Mahabir epidemiology are interesting but do not establish boron as a treatment for osteoporosis or a substitute for hormone replacement therapy. If you have low bone density or fracture history, boron is at best a small adjunct to vitamin D, calcium, magnesium, weight-bearing exercise, and prescription therapy where indicated.
Sources
- 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;25(1):54-58.
- Nielsen FH, Hunt CD, Mullen LM, Hunt JR. Effect of dietary boron on mineral, estrogen, and testosterone metabolism in postmenopausal women. FASEB J. 1987;1(5):394-397.
- Pietrzkowski Z, Phelan MJ, Keller R, Shu C, Argumedo R, Reyes-Izquierdo T. Short-term efficacy of calcium fructoborate on subjects with knee discomfort: a comparative, double-blind, placebo-controlled clinical study. Clin Interv Aging. 2014;9:895-899.
- Pizzorno L. Nothing Boring About Boron. Integr Med (Encinitas). 2015;14(4):35-48.
- Mahabir S, Spitz MR, Barrera SL, Dong YQ, Eastham C, Forman MR. Dietary boron and hormone replacement therapy as risk factors for lung cancer in women. Am J Epidemiol. 2008;167(9):1070-1080.
- Benderdour M, Bui-Van T, Dicko A, Belleville F. In vivo and in vitro effects of boron and boronated compounds. J Trace Elem Med Biol. 1998;12(1):2-7.
- NIH Office of Dietary Supplements. Boron - Health Professional Fact Sheet (Tolerable Upper Intake Level 20 mg/day for adults).
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.