Millions of men all over the world have asked: Does Propecia work? In clinical tests Propecia was found to have a positive effect on 83% of those who used it. This is a monumental result for preventing hair loss and it is by far the best in the industry. However, with so many weighted clinical trials out there how do we know if Propecia really does work?In 1998, the FDA (Food and Drugs Administration) gave their approval to Merck & Co to market this drug. This is a huge vote of confidence because to be FDA approved you need to go through a vigorous testing and invest a serious amount of capitalTests to prove Propecia Does WorkThe study that was needed to gain FDA approval was performed over a 2 year period. In this study 1500 men all with male pattern baldness used the hair regrowth drug. Of those that used it 83% of them experienced positive effects with either maintaining the hair that they already had or even experiencing much thicker hair.So, does Propecia work? The answer is yes, for the majority of people who use it and this is according to one of the most respected associations in the world.How does Propecia Work?Male pattern baldness is a genetic disposition. This is why many men believe that there could not be a successful treatment to stop or even reverse male pattern balding. However, the problem is that these genes cause an over production of the male hormone Dihydrotestosterone (or DHT for short).It is this hormone that causes the hair follicles to shut down which means that no new hair is produced and the hair that you have can fall out.