Boron
A trace mineral that boosts free testosterone, supports bone health, and improves vitamin D metabolism.
Boron is a trace mineral that plays an underappreciated role in hormone metabolism, bone health, and cognitive function. Research shows that boron increases free testosterone by reducing SHBG and estradiol, improves vitamin D metabolism, supports bone strength, and reduces inflammatory markers. Despite being one of the cheapest supplements available, it provides meaningful hormonal and metabolic benefits.
Evidence-Based Benefits
Free Testosterone Increase
A landmark study showed 10mg/day boron increased free testosterone by 28% and reduced estradiol by 39% within one week. It lowers SHBG, freeing bound testosterone.
Estrogen Metabolism
Reduces estradiol levels, which may benefit men on TRT or those with estrogen dominance symptoms.
Bone Health
Improves calcium, magnesium, and phosphorus metabolism. Research shows reduced urinary calcium loss and improved bone mineral density.
Vitamin D Enhancement
Boron extends the half-life of vitamin D in the body and may improve conversion to the active form (1,25-dihydroxyvitamin D).
Anti-Inflammatory
Reduces CRP, TNF-alpha, and IL-6 at doses of 6-10mg/day. May benefit joint pain and arthritis.
Cognitive Function
Boron deprivation studies show impaired cognitive performance, alertness, and memory. Adequate boron supports brain electrical activity.
Dosing Guide
Most research uses 6-10mg/day. Start with 3mg and increase to 6-10mg. Upper tolerable limit is 20mg/day for adults. Very inexpensive supplement. Dietary boron comes from fruits, nuts, and vegetables, but most people consume only 1-2mg from food.
Forms & Comparison
Boron Citrate
Most commonly available and well-absorbed form.
Boron Glycinate
Chelated form with good bioavailability.
Calcium Fructoborate
Food-form boron found in fruits. Some evidence for joint health specifically.
Cautions & Interactions
- Upper tolerable limit is 20mg/day — do not exceed.
- Toxicity symptoms (at very high doses) include nausea, vomiting, and diarrhea.
- Safe at recommended doses (3-10mg/day).
- Not well-studied in pregnancy — avoid supplementation.
- Very few drug interactions known.
Frequently Asked Questions
How quickly does boron affect testosterone?
The most cited study showed measurable increases in free testosterone within 7 days of 10mg/day supplementation. The effect appears to be sustained with continued use.
Should I take boron if I'm on TRT?
Potentially. Boron lowers SHBG, which increases free testosterone. If your SHBG is high on TRT, boron may help improve free T without changing your dose. It also lowers estradiol, which some TRT patients find helpful. Discuss with your prescriber.
Can I get enough boron from food?
The average dietary intake is 1-2mg/day from fruits, nuts, and vegetables. Research showing hormonal benefits uses 6-10mg/day — difficult to achieve from food alone. Supplementation is reasonable and very affordable.
Related Content
This page is for educational purposes only. It is not medical advice. Supplements are not FDA-regulated for efficacy. Consult a healthcare provider before starting any supplement, especially if you take medications.