Hair Review

Each strand is a "mini-organ" composed of about 90% keratin , a tough protein also found in nails.

: Hair grows in three repeating phases: Anagen (growth, lasting 2–7 years), Catagen (transition), and Telogen (resting/shedding). Each strand is a "mini-organ" composed of about

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 lasting 2–7 years)

: The middle layer that provides strength, elasticity, and color through melanin. a marker of cultural identity