Best Boron Supplement 2026: Ranked by Form, Dose & Cost per mg
The best boron for most people is NOW Boron 3 mg: one capsule gives the 3 mg most bone studies used, with nothing else added, for $0.06 a day. Life Extension scores a point higher on its own certificate claim. Boron trials are small and short, and the hormone results disagree.
By Erin Rose Updated October 19, 2026 How we score
Our pick for: Most people
NOW Boron 3 mg
7.0/10 Our score
Life Extension scores 8.0, one point more, only for its own certificate claim
- Boron a day
- 3 mg1 capsule; the amount most bone studies used
- Form
- GlycinateAlbion Bororganic Glycine, boron only
- Testing
- No claimNo boron is on a public testing list
- Cost
- $0.06 a dayVitacost price; Amazon’s can differ
Why we pick it One capsule gives 3 mg of boron as glycinate and nothing else, for about the same price as the cheapest. It ties Swanson on score; Swanson mixes three boron forms.
What you give up NOW makes no outside testing claim, and no boron product is on a public testing list. Life Extension offers its own certificate of analysis; see below.
Which boron is right for you?
Here are two other choices.
Want a brand certificate of analysis?
Life Extension gives the same 3 mg for $0.05 a day at its own price and offers a certificate of analysis, which names no lab. Each capsule also has 25 mg of vitamin B2. If you want that certificate, buy Life Extension.
Life Extension Boron
8.0/10 · $0.05 a day · plus vitamin B2
Want the amount used in hormone trials?
Vitamatic gives 10 mg in one tablet for $0.07 a day. That is the amount in short hormone trials, whose results disagree, half the US adult limit of 20 mg, and equal to the 10 mg limit the European Food Safety Authority uses, so do not add other boron products.
Vitamatic Chelated Boron 10 mg
6.0/10 · $0.07 a day · 10 mg
Not sure how much to take?
Most bone studies used 3 mg a day, and the US adult upper limit is 20 mg. See the boron dosage guide, with limits by age.
Boron supplements we compared
Scored on dose, testing, cost, label and recalls. Our pick comes first, then by score. Costs are for one label serving at each brand’s own price, checked October 19, 2026.
| Boron | Per day | Why it is or is not a pick |
|---|---|---|
| NOW Boron 3 mg7.0/10 | $0.06 | Our pick: 3 mg, boron only, about the lowest cost; no testing claim, same as Swanson |
| Life Extension Boron8.0/10 | $0.05 | Same 3 mg, about the same cost; brand certificate of analysis; adds 25 mg vitamin B2 |
| Swanson Triple Boron7.0/10 | $0.06 | Same 3 mg and score, 250 capsules; a mix of three boron forms; no testing claim |
| Vitamatic Chelated Boron 10 mg6.0/10 | $0.07 | 10 mg tablet, half the adult upper limit; no testing claim |
| Pure Encapsulations Boron5.0/10 | $0.23 | 2 mg a capsule, below the 3 mg most bone studies used; costs the most |
How to read a boron label
Look for the milligrams of boron per serving on the Supplement Facts panel. Calcium fructoborate products often list the compound’s weight instead, which is not the boron.
Does boron work?
The evidence is thin. Boron trials are small (8 to 113 people) and short (one day to 2 months). Hormone results disagree, joint results come from small calcium fructoborate trials, and the bone evidence is mostly urine and blood markers (NIH Office of Dietary Supplements). One review calls 3 mg useful for bones but rests on 11 small studies (Rondanelli 2020). Boron is not an essential nutrient. More in our boron guide.
Questions people ask
Does boron raise testosterone?
The trials disagree. Free testosterone rose after 10 mg a day for a week in 8 men (Naghii 2011), but 2.5 mg a day for 7 weeks did nothing in 19 bodybuilders (Ferrando 1993).
Is boron good for joints?
Maybe. One small 2-week trial of calcium fructoborate, a boron form, found less knee discomfort (Pietrzkowski 2014). The NIH says this might hold promise but needs more trials. Our pick is a different form, so the result may not carry over.
Is boron safe?
The NIH lists no known drug interactions. It has no data on harm from boron in food or water, which is not proof of safety, and its 20 mg limit comes from animal studies of harm to reproduction and growth. Count every product with boron and stay under 20 mg a day as an adult; children’s limits are lower. Pregnant or breastfeeding? Ask your doctor.
How we score
Five marks: does a serving hold the 3 mg most bone studies used (without going over the 20 mg adult limit); is the product on a public testing list; what the servings that reach 3 mg cost at the brand’s own price against the cheapest; does the label state the amount without other active ingredients; and the brand’s FDA recall record. Dose and testing are worth up to 3 points each, cost up to 2, label and recalls up to 1 each. More on our method.
Sources
- NIH Office of Dietary Supplements. “Boron: Fact Sheet for Health Professionals.” ods.od.nih.gov
- Naghii MR, et al. “Comparative effects of daily and weekly boron supplementation on plasma steroid hormones and proinflammatory cytokines.” J Trace Elem Med Biol. 2011. PubMed 21129941
- Ferrando AA, et al. “The effect of boron supplementation on lean body mass, plasma testosterone levels, and strength in male bodybuilders.” Int J Sport Nutr. 1993. PubMed 8508192
- Pietrzkowski Z, et al. “Short-term efficacy of calcium fructoborate on subjects with knee discomfort: a comparative, double-blind, placebo-controlled clinical study.” Clin Interv Aging. 2014. PubMed 24940052
- Rondanelli M, et al. “Pivotal role of boron supplementation on bone health: A narrative review.” J Trace Elem Med Biol. 2020. PubMed 32540741
- Testing lists: NSF/ANSI 173, NSF Certified for Sport, Informed Sport and USP snapshots list no boron product. Labels and prices from each brand’s page or Vitacost.