Androgenetic alopecia in men

Male pattern baldness or androgenetic alopecia is the most common form of permanent hair loss. This form of male baldness is for the most part attributable to hereditary factors. About one third of all men between 25 and 40 suffer from hair loss. Androgenetic alopecia in men is classified according to the severity of baldness using the Norwood Hamilton scale (see image below). This scale allows a classification of the current stage of baldness. Male baldness generally starts with a receding hairline at the temples as well as in the middle of the scalp. It then progresses until all that remains is a horseshoe shaped fringe of hair, sometimes referred to as a “tonsure”.

Norwood Hamilton scale

A factor contributing to baldness is the so-called dihydrotestosterone, or DHT for short. This is produced with the help of the enzyme 5α-reductase out of the male testosterone hormone. The hair on top of men's heads is particularly sensitive to this hormone. The growth phase of individual hairs becomes shorter, with hair falling out prematurely. 

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