Keratin is a protein that makes up hair and also stimulates hair growth. Hair has a growth cycle with three concurrent and distinct phases. Each phase has specific characteristics that determine the length of hair.
Each strand of hair on our body is at different stage of development. After the cycle of Anagen, Catagen and Telogen is complete, the hair is gone and a new cycle restarts with a new strand of hair being formed.
The speed of hair growth is nearly 1.25 centimeters or 0.5 inches per month. This means that hair grows about 6 inches in a year.
This is the growth phase. The longer the hair stays in the anagen phase, the longer it will grow. 85% – 90% of the hairs on one’s head is in this phase at any given time.
This phase is, also known as the transitional phase. Here, the follicle renews itself.
This is a resting or shedding phase for hair. The follicle remains dormant for one to four months.