How much hair you have depends on how many hairs are in their active growth cycle and how long that cycle lasts. Hair revolves through three phases of growth: anagen, catagen, and telogen.
Anagen is the active growing phase in which the hair bulb is intact. The hair grows in both directions, upward and downward. Early anagen is when the bulb is closest to the surface of the skin, and contains an abundance of melanin (pigment) allowing for the most effective treatment.
Catagen is a brief intermediate phase between anagen and telogen. It is the regression phase when the lower part of the hair stops growing but is not shed, and the body absorbs the lower third of the follicle.
Telogen is the resting phase. The hair bulb is no longer present, and is now a club hair, which will fall out, or be pushed out of the follicle by a new anagen growing hair.
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