Hair Apr 2026

: The middle layer that provides strength, elasticity, and color through melanin.

Each strand is a "mini-organ" composed of about 90% keratin , a tough protein also found in nails. : The middle layer that provides strength, elasticity,

Hair is a complex biological structure that serves as a powerful medium for self-expression , a marker of cultural identity, and a functional protective barrier for the human body. The Biology of Hair a marker of cultural identity