So obviously DHT is the primary cause of male pattern baldness (with the genetic predisposition). What is the cause for those people who don't respond to finasteride then? Or even the more extreme dutasteride? If someone continues to lose their hair at the same rate on or off the drug, then wouldn't something else most likely be causing the loss? Clearly if you lower your DHT levels by 90%, as dutasteride does, it should stop your hair loss or possibly cause some regrowth. But this isn't the case for everyone. Does that mean that some other hormone, such as testosterone, is causing the hair loss for these people, or is this something we just don't know yet?