Many men notice hair loss which begins early during puberty. This hair loss is mostly due to hypersensitivity to the hormone dihydrotestosterone (DHT). It weakens predisposed hair roots in the scalp. This shortens the hair growth phases and terminates their life prematurely. If more and more hair roots die in this manner, baldness will be the result.
Additional factors which can also speed up hair loss: physical strain, environmental toxins, psychosomatic problems, stress and vitamin deficiencies.