It is the high level of DHT in an organism to blame for having hair shortening and thinning. The key is that dihydrotestosterone miniaturizes the susceptibility of hair follicles, which in their turn start producing colorless vellus hair instead of normal thick and dark ones. As time passes, hair becomes shorter and thinner and eventually disappear leaving only baldness on the head. By reducing the DHT level-up to 60%, finasteride prevents the above-described entire process. That’s why men, using Propecia not only report about having their hair loss stopped, but also experience additional hair growth. The quality of hair, as a result, changes significantly, too. Hair becomes much thicker and more voluminous.