P.R.P., considered a nonsurgical treatment, is not covered by insurance, and clinical studies about its effectiveness (and longevity of results) are not conclusive because different doctors use different mixes. But P.R.P. has a long (though also inconclusive) history of use elsewhere in the body. Athletes like Kobe Bryant have received the treatment in an attempt to heal injuries.
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.