People read articles and ads of hair loss supplements in almost every publication everyday. These are herbal supplements and steroid based hair loss supplement but do these Hair Loss supplements really work? Most of the hair loss is caused by DHT or Dihydrotestosterone. This is a naturally occurring enzyme, and one of the most potent ones in the human body, and is produced by the reaction of an enzyme called 5 alpha-reductase with the hormone testosterone; this DHT is the main cause of thinning of hair which finally leads to hair loss in men and women.