Boron: Benefits, Dosage, Forms & Research

What the Research Says

Boron research is still emerging but promising. The foundational work by Nielsen et al. (USDA, 1987) established that boron deprivation in postmenopausal women increased urinary calcium loss and negatively affected mineral metabolism. Naghii et al. (2011) demonstrated short-term testosterone elevation with 10mg daily in a small (n=8) but well-designed study. The most robust clinical evidence comes from calcium fructoborate studies: Pietrzkowski et al. (2014, n=60) showed significant CRP reduction in a double-blind RCT. However, most boron studies are small, and larger confirmatory trials are needed.

Benefits of Boron

• Bone health — Naghii and Samman (1993) showed boron supplementation reduced urinary calcium excretion by 44% and increased serum 17-beta estradiol and testosterone in postmenopausal women, supporting bone preservation
• Testosterone support — a 2011 Naghii et al. study found 10mg boron daily for 7 days increased free testosterone by 28% and decreased estradiol by 39% in healthy men
• Anti-inflammatory — calcium fructoborate (CFB) reduced CRP levels by 31% in a 2014 RCT by Pietrzkowski et al. in subjects with elevated inflammatory markers
• Vitamin D metabolism — boron supplementation increases serum 25-hydroxyvitamin D levels, particularly in vitamin D-deficient individuals
• Joint comfort — a 2004 Newnham study found boron supplementation improved joint comfort in areas with low-boron soil and water

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

• Generally very well-tolerated at 3-10mg daily
• Nausea and diarrhea (uncommon, usually at higher doses)
• Upper GI discomfort (rare)
• Toxicity with massive doses (>100mg) — vomiting, diarrhea, skin rash

Drug & Supplement Interactions

• May enhance the effects of estrogen therapy — use caution with HRT
• May interact with medications metabolized by the liver
• Enhances magnesium and calcium retention — beneficial synergy with these supplements