The hair cycle is a repetitive process that governs the growth, shedding, and regrowth of hair, from the anagen (active) phase to the telogen (resting) phase. It applies to mammals, and even humans experience an average hair cycle of 2 to 6 years on the scalp.
Understanding the hair cycle is essential for maintaining healthy hair. It influences hair growth, texture, and volume. One key historical development in hair cycle research is the discovery of growth factors, like minoxidil, that can help treat hair loss by prolonging the anagen phase.