Dihydrotestosterone or DHT is a male hormone found in hair follicles and plays major role in hair loss. Hair follicles’ sensitivity to DHT is known to cause androgenic alopecia commonly called male or female pattern baldness. This is due to shrinkage of hair follicles caused by DHT and additionally it causes shorter life span for hair follicles too. Continued shrinkage of hair follicles is called miniaturization and it causes hair to grow for a limited and shorter periods, make the color become faded, make hair finer and smaller, and causes the eventual vellus condition. Vellus hair is so thin that is barely noticeable.
An enzyme contained in oil glands of hair follicles known as Type II 5-alpha reductase is what convert testosterone into DHT. This and the DHT testosterone floating in hair follicles is the culprit that causes hair loss according to new scientific research. Compared to women, men have more testosterone. However, even a lower level of testosterone in women is bad when it comes to hair loss.
Hormones do not stay in your system at a constant level. As we age, after age 30, testosterone level drops by about 10 percent for each decade. For women, as they get closer to menopause levels can be seen dropping remarkably.