In clinical studies of mostly white women aged 18-45 years with mild to moderate degrees of hair loss, the following response to 2% minoxidil topical solution was reported: 19% of women reported moderate hair regrowth after using 2% minoxidil topical solution for 8 months (19% had moderate regrowth; 40% had minimal regrowth). This compares with 7% of women reporting moderate hair regrowth after using the placebo, the liquid without minoxidil in it, for 8 months (7% had moderate regrowth; 33% had minimal regrowth).
According to practitioners of traditional Chinese medicine, hair health is tied to two things: kidney energy and the blood, which nourish the hair. The solution: acupuncture and Chinese herbs. While there isn't a lot of hard science to back this up, Maureen Conant, a TCM practitioner at Full Bloom Acupuncture in Seattle, says that she's seen women's hair stop falling out and then gradually regenerate after a few months of weekly treatments.