Hair & Nails

Supplements studied for promoting hair growth and nail strength.

17 supplements have studies linked to this goal. Collagen scores highest (5/10), followed by Iron (4/10) and Saw Palmetto (4/10). 1 of them reach moderate or strong support — the rest are thinly studied or showed little effect.

Supplements rated for Hair & Nails

How to read these scores

The 0–10 score reflects how well the evidence supports a supplement for this specific goal, independent of how much it has been studied overall. It is an editorial rating checked against meta-analyses — how we set it.