Boron: Clinical Evidence & Substantiation Summary

Clinical Trials
18
Strongest Evidence
Bone & Hormonal Health
Typical Dosage
3–10 mg/day
Common Forms
Sodium borate

What Is Boron?

Boron is a bioactive trace mineral that impacts the metabolism of other minerals (calcium, magnesium) and the levels of steroid hormones. It is increasingly studied for bone health, joint support, and hormonal optimization.

Mechanism of action: Boron reduces the excretion of calcium and magnesium in urine and increases the half-life of vitamin D and estrogen. It also reduces SHBG (sex hormone-binding globulin) levels, potentially increasing free testosterone. Boron has potent anti-inflammatory effects by reducing CRP.

Clinical Evidence Summary

Below are 3 key clinical studies on Boron. Nutra Comp analyses 18+ studies in its full clinical evidence report.

RCT, double-blind crossover2011PMID: 21631525

Boron supplementation and steroid hormones: RCT

Population: 8 healthy men

Key finding: 10 mg boron/day for 1 week significantly reduced CRP (anti-inflammatory) and significantly increased free testosterone by 28% (p<0.05).

Calcium fructoborate and joint comfort: clinical evaluation

Population: 60 adults with knee OA

Key finding: Calcium fructoborate (216 mg/day) significantly improved joint comfort and mobility and reduced inflammatory markers within 14 days (p<0.01).

Mechanism review2021PMID: 33260899

Boron and bone mineral metabolism: review

Population: Clinical and animal data

Key finding: Boron is a required co-regulator for optimal calcium and vitamin D utilization. Deficiency impairs bone recovery and mineralization.

Evidence-Based Structure–Function Claims

Sample FDA-compliant structure–function claims generated by Nutra Comp, each linked to clinical evidence and scored for confidence.

8
Supports healthy bone mineral density and calcium metabolism
Category: Bone Health · Confidence: 8/10
6
Supports healthy free testosterone levels already within the normal range
Category: Hormonal · Confidence: 6/10
7
Supports joint comfort and healthy inflammatory response
Category: Inflammation · Confidence: 7/10

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Related Ingredients

Vitamin D3
127 studies · Bone Health & Calcium Metabolism
Magnesium
89 studies · Sleep & Relaxation
Calcium
134 studies · Bone Health

Key Terms

Randomised Controlled Trial (RCT)BioavailabilityClinically Effective Dose

Frequently Asked Questions

Is boron FDA approved?

Boron is sold as a dietary supplement. There is no established FDA Daily Value, but the Tolerable Upper Limit is set at 20 mg/day for adults.

Does boron really increase testosterone?

Clinical data shows it can reduce SHBG, which increases the percentage of 'free' (bioactive) testosterone. While significant, it is not a direct hormonal treatment and results vary by individual baseline.

What is the best form?

Calcium fructoborate is a naturally occurring plant form found in fruits and vegetables and has some of the strongest joint-health clinical data. Glycinate is also highly bioavailable.

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