Boron is a trace mineral, not an herb — and it has one of the more specific (if small-scale) human studies behind its inclusion in male vitality formulas.
The Key Study
A small pilot study found that supplementing with 10 mg of boron per day for one week increased free testosterone by roughly 28% and decreased estradiol (an estrogen) by about 39% in participants. That's a notable shift for such a short intervention — but it's important to be clear about the scope: this was a small pilot study with only eight participants, not a large randomized trial. Researchers who cite it consistently note that larger, longer-term studies are needed to confirm the effect.
How It's Thought to Work
Boron appears to influence how the body metabolizes testosterone, potentially converting more of it into its "free," bioavailable form. It's also thought to enhance the body's ability to metabolize and retain vitamin D, a nutrient with its own links to testosterone production, immune function, and bone health.
Typical Dosage
Commonly cited dosing for testosterone-related use is 6–10 mg per day, with most sources advising against exceeding 20 mg per day.
The honest summary: The direction of the evidence for boron is positive, and the underlying mechanism is biologically plausible, but the human studies are small and short. Some higher-quality studies on boron for other outcomes have found no significant benefit, so it's reasonable to view it as a promising, low-dose addition to a formula rather than a proven standalone testosterone booster.
Where It Shows Up
Boron Amino Acid Chelate is one of seven ingredients in HorseWood.
See the Full Ingredient Panel
Check the exact boron dose and full formula in HorseWood.
View HorseWoodSources: Hone Health, Hims.