Minoxidil works by enlarging miniaturized follicles and reversing the miniaturization process. This prolongs the growth phase of the hair cycle, allowing the hair to become longer and thicker with more follicles in the growth phase. Even though the growth phase may be prolonged, the follicle will continue to cycle. After several cycles of hair regrowth the maximum benefit is achieved. It is also thought that Minoxidil opens potassium channels as well but I am not sure if that is true or not but I have heard that mentioned.