Compare to the active ingredient of Mens Rogaine. Minoxidil Topical Aerosol, 5 Percent is an unscented hair regrowth treatment for men. This easy-to-use topical treatment revitalizes hair follicles and is clinically proven to help regrow hair. It is for men who have a general thinning of hair on the top of the scalp. Minoxidil is the number one dermatologist recommended OTC hair regrowth treatment active ingredient (of U.S. Physicians surveyed by an independent market research firm).