Physiological hair loss is a natural occurrence of cyclically occurring. In place of the hair that falls grow back new. It is a so-called hair cycle, which on average over the life of a man repeats from 20 to 40 times. On the scalp there are about 100 000 hair, and the life of the hair is on average 4 to 7 years. For the norm, hair loss to 80 per day is assumed. It is apparent from the above data that the statistical person should have full head hair until late old age.
In practice, at different ages we encounter excessive hair loss and graying. Endogenous and exogenous factors are affected. The main problem is hair loss caused by exogenous factors; this applies to about 70% of people. Endogenous factors are mainly genetically determinable hormonal and metabolic disorders. With exogenous factors we contact in everyday life, among others: drugs, chemicals, inadequate diet, cosmetics, atmospheric pollution, solar radiation and the conditions of emotional tension. They cause damage to varying degrees of hair follicles, which leads to excessive hair loss and baldness.
The toxic effect of the above-mentioned factors is based on the release of an excessive amount of free oxygen radicals in the body. This leads to what is known as oxidative stress.