We used PRP (Platelet Rich Plasma) and De/Rive to stimulate the hair follicles to grow again! Remember, you do not want to wait until you have advanced hair loss. If you do this, then there is a high probability of the hair follicles dying. Once that happens, there is no way to get them to grow hair again. Once you see the early signs of hair loss, you want to start with PRP and De/Rive. This is your best option (as of now) to promote the regrowth of hair.