For as many as 20% of men, hair loss can begin before their 21st birthday. Hair loss is due to Dihydrotestosterone (DHT), the hormone testosterone becomes when it is exposed to an enzyme called 5 alpha reductase. DHT makes the hair follicles vacate a man’s scalp by slowly destroying clusters of hair follicles. DHT causes the hair follicles to miniaturize over many years. The process may begin slowly but the progression is relentless.
At first only thinning of hair is noticed, not clear baldness. Some men embrace the process, shaving their heads in response, but many regret the appearance of aging while they still feel young and vital. Fortunately, we have an understanding of how DHT undermines hair growth and therapies exist to interrupt or slow the process.