humanhair

Human hair refers to the keratinous strands that grow from follicles in the skin, most prominently on the scalp. It is primarily composed of keratin, a durable protein, and its visible shaft has three layers: the cuticle on the outside, the cortex beneath, and, when present, a central medulla. Hair color comes from melanin produced in the follicle, while texture and thickness reflect variations in follicle shape and keratin organization.

Growth and shedding: Each follicle cycles through anagen (growth), catagen (transition), and telogen (rest). Scalp hair typically grows about 1 to 1.5 cm per month and remains in growth for years. Daily shedding ranges roughly 50 to 100 hairs. Hair density, curl pattern, and diameter differ by genetics, ethnicity, age, hormonal factors, and health.

Uses and processing: Human hair is widely used in wigs, extensions, and prosthetic applications, as well as in cosmetic and medical contexts. Hair may be donor-sourced or collected with consent; products distinguish virgin, remy, and non-remy hair based on cuticle alignment and cleanliness. Processing often includes washing, decontamination, bleaching or dyeing, and styling, all of which can affect longevity and texture.

Sourcing, ethics, and care: The global hair market raises ethical considerations around donor consent, fair compensation, and the risk of exploitation. Quality is commonly judged by length, cuticle integrity, color, and absence of chemical or mechanical damage. Proper care—gentle washing, low-heat styling, and avoiding harsh chemicals—helps preserve hair integrity.