DHT is a potent form of testosterone, created when an enzyme interacts with testosterone in various places in the body. It is present in men and women. Unfortunately, less is fully known about precisely why DHT causes hair loss. What is known is that DHT binds to ‘receptors’ in the hair follicles. When the hair sheds and regrows the new hair tends to grow smaller. After several cycles the hair can stop growing and may be so thin that it is hardly visible.