Independent supplement ratingsUS and Canada · Updated weekly
A ratings desk for a category that has spent thirty years grading its own homework.
A ratings desk for a category that has spent thirty years grading its own homework.
Boron is one of the more interesting minor ingredients: a few small studies suggest that around 6–10 mg a day can modestly raise free testosterone and reduce sex-hormone-binding globulin (SHBG) over a week or so. The effect is small and the studies are small, but it's a real, plausible signal.
It's cheap and low-risk at these doses, which is why it's a reasonable inclusion on a transparent testosterone-support label.
Don't expect much on its own — think of boron as a sensible, well-priced supporting nutrient rather than a driver. Research on PubMed →
Small human studies suggest boron can nudge free testosterone upward and lower sex hormone-binding globulin, at least in the short term. The trials are small and short, which is why it earns a C rather than a B on our evidence scale. It is cheap, which is the main reason it appears on so many labels.
The studied range is roughly 6–10 mg a day. Products in this category often carry less than that while listing it prominently, so check the Supplement Facts panel against the number — the Label Dose Checker does the comparison for you.
Reviewed by the NFS editorial team · Educational only — not medical advice.