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Boron

Lowering SHBG and modestly increasing free testosterone

Evidence · Grade DSafety · Generally safe
Traditional useInteraction riskNeeds more research

Trace mineral with small human trials showing increases in free testosterone and reductions in SHBG and inflammatory markers, especially after low intake.

Last reviewed June 1, 2026 · AI-assisted, human-reviewed
Boron is a trace mineral found in fruits, vegetables, nuts, and legumes. It is not classified as an essential nutrient for humans, but several short human trials suggest it influences sex hormone metabolism, vitamin D status, bone health, and inflammation. In small studies, boron supplementation (typically 6–10 mg/day) reduced sex hormone-binding globulin (SHBG) and increased free testosterone and free estradiol within roughly a week, while also lowering hs-CRP and inflammatory cytokines. Effects appear most pronounced in men with lower baseline intake.

Quick answer

What it is: Boron is a trace mineral found in fruits, vegetables, nuts, and legumes.

May support:Hypogonadism (Low Testosterone), Osteoporosis

Evidence:Evidence · Grade D

Safety:Safety · Generally safe

Evidence Summary

Evidence · Grade D

Several small human trials show consistent reductions in SHBG and increases in free testosterone, but trials are short and sample sizes are modest.

Last reviewed · Jun 2026

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Your experience for Hypogonadism (Low Testosterone):

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Why It Works

Boron reduces SHBG and inflammation, which can increase the free (bioactive) fraction of testosterone.

How it works in more detail

The precise mechanisms by which boron affects human physiology are not fully elucidated. However, it is suggested that boron may interact with various metabolic pathways. One proposed mechanism involves its potential to reduce the concentration of sex hormone-binding globulin (SHBG), a protein that binds to sex hormones like testosterone, making them biologically inactive. By lowering SHBG, boron could theoretically increase the amount of free, biologically active testosterone. Additionally, boron may influence the activity of enzymes involved in steroidogenesis, the process of synthesizing steroid hormones. It has also been suggested to play a role in the metabolism of other minerals and vitamins crucial for hormonal balance, such as calcium, magnesium, and vitamin D.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
3–10 mg/day with food; many practitioners use 6 mg/day for hormonal/inflammatory support.
Research dosage range
3–10 mg/day in clinical trials.
Typical onset
Hormonal and inflammatory changes seen within 1–8 weeks.
Typical forms
Capsules, Tablets
Quality markers
When selecting a boron supplement, look for products from reputable manufacturers that provide third-party testing for purity and potency. Check for clear labeling of the boron compound (e.g., boron citrate, aspartate) and the elemental boron content per serving. Avoid products with excessive filler
Medication interactions
  • Estrogen and hormone therapies (theoretical)
  • Magnesium / calcium / vitamin D (interactions in metabolism, generally synergistic)
Avoid if
  • Hormone-sensitive cancers (theoretical, due to free hormone increases)
  • Severe kidney disease
Pregnancy / lactation
Limited supplemental data in pregnancy; do not exceed the upper limit of 20 mg/day.

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Suggested dosage

3–10 mg/day with food; many practitioners use 6 mg/day for hormonal/inflammatory support.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Inorganic boron and organic forms (boron citrate, glycinate, aspartate)

Traditional use

Used historically as a dietary mineral via plant foods; supplementation is modern.

Safety

Safety warnings

The Tolerable Upper Intake Level for adults is 20 mg/day. Stay well below this; long-term safety of high-dose supplementation is not established.

Avoid if

  • Hormone-sensitive cancers (theoretical, due to free hormone increases)
  • Severe kidney disease

Medication interactions

  • Estrogen and hormone therapies (theoretical)
  • Magnesium / calcium / vitamin D (interactions in metabolism, generally synergistic)

Reported side effects

  • GI upset at higher doses
  • Headache
  • Skin irritation (rare)

Pregnancy & lactation

Limited supplemental data in pregnancy; do not exceed the upper limit of 20 mg/day.

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

No indexed evidence yet. We're still building out this remedy's evidence ecosystem.

Limitations: A significant limitation is the absence of specific PubMed studies for review. This means there is a lack of recent, peer-reviewed, human clinical trials to support definitive claims regarding boron's efficacy for specific conditions. The existing knowledge is likely derived from older studies, in vitro research, animal models, or observational data, which may not directly translate to human outcomes or establish causality.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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