Biotin

Brittle nails and genuine deficiency are the only places it's moved anything in a person.

Also called Vitamin B7, Vitamin H, Coenzyme R, D-Biotin

Who it's forAny man on a hair, skin and nails supplement or a high-dose B complex.

The item

Three squares: proven in human trials. Two: a strong signal. One: early human data. Striped: the trials disagree.

Emergency: call 911.

I am not a doctor. This is not medical advice. This is self-education. Talk to a physician who has your history before you change anything.