Regaine Men 5% Minoxidil Topical Hair Regrowth Solution is the only over-the-counter treatment clinically proven to help prevent further hair loss. Using it twice daily can even reverse the process, resulting in regrowth. Minoxidil works by helping the blood flow to the hair follicles and increasing follicular size and hair shaft diameter, stimulating and prolonging hair growth. It has been shown to help prevent further hair loss in 4 out of 5 men and help stimulate regrowth for a thicker, fuller head of hair. Regaine works best in men with recent hair loss or thinning at the top of the scalp but can be used by men with a receding hair line, as this is typically an early stage of hereditary hair loss.