Which hormone causes hair loss?
There are
3 phases in a hair growth cycle that continually repeat unless affected by a hormone called Dihydrotestosterone or DHT. Those 3 cycles include:
- Anagen 2-8 years – hair growth
- Categen 2-4 weeks – the upper portion of the follicle detaches from the blood supply and the hair stops growing
- Telogen 2- 4 months – the follicle reattaches to the blood supply, the old hair is pushed out and the a new hair grows.
It is normal for the average person to lose anywhere between
50 to 100 hairs per day while new hair is constantly growing. In people who have male pattern baldness, DHT interferes with the follicle’s ability to produce new hairs by
prolonging the Telogen phase and
shortening the Anagen phase. When this happens, hair loss is not offset by hair growth. Hair falls out more quickly and new hair growth diminishes and eventually stops altogether.
See how you can reverse the effects of DHT with propecia and see why a hair transplant is the most effective solution to hair loss.