Hair Problems

Oxidative stress is a biological process linked to UV exposure, pollution, smoking and cellular redox balance. This guide explains what current evidence shows — and does not show — about...

The scalp surface is generally mildly acidic, but there is no single “ideal pH” for everyone. This guide explains what current evidence says about shampoo pH, the scalp barrier, dandruff,...

DHT is an important androgen in the biology of male androgenetic alopecia. This guide explains the 5-alpha-reductase pathway, follicle sensitivity, key differences between male and female pattern hair loss, and...