Regaine Top Solution 2% Is A Clinically Proven Topical Treatment Designed To Stimulate Hair Growth And Slow Hair Loss In Individuals With Hereditary Hair Thinning. It Contains Minoxidil 2%, An Active Ingredient That Revitalizes Hair Follicles To Promote New Growth. Active Ingredient: Minoxidil 2%: Stimulates Hair Follicles, Increases Blood Flow To The Scalp, And Encourages Hair Regrowth.