If you lose hair because of high testosterone or lack of it, there is no guaranteed treatment. However, hair loss provoked by too much testosterone or its shortage may be reversible with correct treatment. To slow down the hair loss you need to stop the transformation of free testosterone to dihydrotestosterone by such means as your doctor will recommend. Normally you should take the medecine once a day, and after a few months you can notice positive results. However, if you stop taking the drug against baldness, your hair will start to fall out again. Such treatment is not safe for women. Therefore, before you start to treat hair loss, you have to visit a specialist and undergo all the necessary tests.