Regaine Extra Strength 5% w/v Solution 3Pk (For Men and Women). Regaine Extra Strength Solution is clinically proven to reverse the progression of hereditary hair loss. Regaine is easy to apply and dries quickly. It works by increasing the blood supply to the hair follicles, which helps to strengthen existing hair and stimulate secondary hair growth. Easy to use. Extra strength treatment. Reverses hair loss and promotes re-growth. For those suffering from hereditary hair loss. Apply directly to the scalp - twice a day, every day.