Regaine Extra Strength Solution: In clinical trials, 3 out of 5 men regrew hair. Clinically proven to help save thinning hair. Regrow hair in men with hereditary hair loss. Reverses the progression of hair loss. Contains a 5% concentration of the active ingredient minoxidil. Use of Regaine Extra Strength Solution: Apply directly to your scalp. Twice a day, every day. Extra Strength Solution is licensed for hereditary hair loss in men aged 18 to 65. Results may become noticeable in just 8 weeks.