Bosley Hair Regrowth Treatment F.D.A. approved 5% Minoxidil Regrow treatment for Men only. 2% formula is for Women. Clinically proven to help regrow hair and slow down or help halt hair loss in some cases. Contains Minoxidil. 2% formula for women. 5% extra-strength formula for men only. Use: Apply one ML up to twice daily to area of thinning. Continued use is necessary or hair loss will begin again.