Minoxidil in hair loss treatment

Minoxidil stimulates hair regrowth. Sites of action include the papilla or matrix cells or possibly both. Biopsies from patients with male pattern hair loss show that the primary response is miniaturization. This is accompanied by shortening of the hair regrowth cycle. There is no evidence of follicular neogenesis. The site of action in hair loss treatment and hair regrowth is probably the papilla.