While the way it works isn't fully understood, the topical hair loss treatment minoxidil (more commonly known by the brand name Rogaine) appears to affect the stages of hair growth. When applied to the scalp, this treatment shortens the resting phase of hair growth and causes the hair to enter the growth stage. Additionally, minoxidil helps the blood vessels carry more oxygen-rich blood to the hair follicles and increase the size of the follicle for thicker, stronger hair growth.