Male pattern hair loss is characterized by a receding hairline and/or hair loss on the top of the head.
Male pattern hair loss is an inherited condition, caused by a genetically determined sensitivity to the effects of dihydrotestosterone, or DHT.
DHT is believed to shorten the growth, or anagen, phase of the hair cycle, causing miniaturization of the follicles, and producing progressively finer hairs.
An enzyme called 5-alpha reductase regulates the production of DHT.
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