Believe it or not, the hormone called androgen that is responsible for the growth of facial hair is known to suppress the growth of scalp hair. With increasing age, androgens stimulate hair growth on the face, but can suppress it at the temples and scalp vertex, a condition that has been referred to as the 'androgen paradox'. The following hormonal changes that come with age are also responsible for men's hair loss:
Hormones are the primary factor that leads to male pattern baldness. Men having premature androgenic alopecia usually have a lower amount of globulin, testosterone, follicle stimulating hormone (FSH), and epitestosterone compared to men with thicker hair. There are also many other factors that come into play when it comes to hormonal imbalances.
Genetics play a huge role in determining whether someone will have androgenic alopecia or not. There is evidence suggesting that people who have a genetic disposition for baldness are more likely to start losing their hair from an early age.
Because of the fact that androgen receptors and androgens are the two factors that initiate alopecia, this topic still remains the subject of much research.
A recent study found that men who go bald early tend to have an unusually abnormal amount of protein called prostaglandin D2. This protein, along with its derivatives is one of the leading causes that block hair growth, which eventually leads to baldness.