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Growth Cycle of Hair

Can you tell me more about the Growth Cycle of Hair ?
Anagen is the active growth phase of hair follicles. The cells in the root of the hair are dividing rapidly, adding to the hair shaft. During this phase the hair grows about 1 cm every 28 days. Scalp hair, for example, stays in this active phase of growth for 2-6 years. The amount of time the hair follicle stays in the Anagen phase is genetically determined and is different for various parts of the body. At the end of the Anagen phase the follicle goes into the Catagen phase.
The Catagen phase is a short transition stage that occurs at the end of the Anagen phase. It signals the end of the active growth of a hair. This phase lasts for about 2-3 weeks while a club hair is formed.

The Telogen phase is the resting phase of the hair follicle. At any given time, 10%-15% of all hairs are in the Telogen phase. This phase lasts for about 100 days for hairs on the scalp and much longer for hairs on the eyebrow, eyelash, arm and leg. During this phase the hair follicle is completely at rest and the club hair is completely formed. Pulling out a hair in this phase will reveal a solid, hard, dry, white material at the root. About 25-100 Telogen hairs are shed normally each day.

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