Which part of the hair cycle is responsible for hair growth?

The part of the hair cycle responsible for hair growth is the anagen phase. During this phase, hair follicles actively produce new hair cells, leading to the elongation of the hair strand. It is characterized by the presence of rapidly dividing cells in the hair bulb, which results in the formation of the hair shaft. The duration of the anagen phase can vary significantly among individuals and different hair types, lasting from several months to many years, depending on genetic and environmental factors. This phase is crucial for achieving the desired length and volume of hair, making it the most vital stage in the overall hair growth cycle.

In contrast, other phases like the telogen phase involve the resting and shedding of hair, while the catagen phase represents a transitional period where hair growth stops. The exogen phase is related to the shedding of the hair shaft but doesn't contribute to the growth itself. Understanding the anagen phase helps in recognizing the biological processes behind hair growth and can inform practices in hair care and treatment.