Regaine For Men 5% Topical Hair Regrowth Solution contains minoxidil at a concentration equivalent to 50 mg per ml and works by increasing the supply of blood and nutrients to hair follicles, helping to strengthen and revitalize them to support hair regrowth at the root. It is indicated for the treatment of alopecia androgenetica in males. Minoxidil is the only clinically proven treatment for male pattern hair loss and promotes regrowth by reversing follicle miniaturization, increasing blood flow, stimulating follicles from resting to growth phase, and extending the growth phase. Temporary increased shedding may occur initially, indicating the start of a new growth cycle. With twice-daily use, results may be seen as early as 8 weeks.