Bone health and density
Boron reduces urinary excretion of calcium and magnesium, and stimulates production of 1,25-dihydroxyvitamin D3 — the active form of vitamin D. Studies show significant improvements in bone density markers.
Testosterone support
A 7-day supplementation study at 10 mg/day showed a 28% increase in free testosterone and 39% decrease in estradiol in men. Boron inhibits SHBG binding, freeing bound testosterone.
Vitamin D activation
Boron enhances the hydroxylation of vitamin D to its active form (1,25-dihydroxyvitamin D3), effectively amplifying vitamin D activity — important in vitamin D-deficient individuals.
Cognitive function
Nutritional boron deprivation studies show impaired cognitive performance, hand-eye coordination, and EEG activity — suggesting boron plays an active role in brain electrical function.
Sex hormone binding globulin inhibition
Boron binds to SHBG (sex hormone binding globulin), reducing its capacity to bind testosterone and estradiol. This increases free (bioavailable) hormone concentrations without affecting total hormone production.
Vitamin D and steroid hormone metabolism
Boron modulates the hydroxylase enzymes involved in converting vitamin D to its active form and influences steroid hormone catabolism in the liver.
NF-κB and inflammatory signaling
Boron supplementation reduces NF-κB activation and downstream inflammatory cytokines (IL-6, TNF-α), contributing to anti-inflammatory effects observed in joint pain studies.
Clinical study of 10 mg/day boron in 8 healthy men for 7 days — evaluating hormone levels pre/post.
8 healthy men. 7-day supplementation.
Free testosterone increased 28.3%, estradiol decreased 38.9%, SHBG decreased, and DHT increased. Also showed significant reductions in inflammatory markers (IL-6, CRP, TNF-α).
Depletion-repletion study examining boron deprivation (0.23 mg/day) vs. adequate intake (3.23 mg/day) in postmenopausal women.
12 postmenopausal women on controlled diets. Crossover design.
Boron deprivation significantly increased urinary calcium and magnesium excretion. Adequate boron reduced these losses and increased serum 17β-estradiol and testosterone.