Take control of your hair loss. N°1 Dermatologist Recommended Compare to the active ingredient of Men's Rogaine. Kirkland Signature Topical Aerosol, 5% (Foam) is an unscented hair regrowth treatment for men. This easy-to-use foam topical treatment revitalizes hair follicles and is clinically proven to help regrow hair. It is for men who have a general thinning of hair on the top of the scalp. For best results, use Topical Aerosol, 5% (Foam) twice daily. Results may occur at 2 months with twice a day usage. For some men, you may need to use Kirkland Signature Topical Aerosol, 5% (Foam) for at least 4 months before you see results. For men 18 years or older. Not for use by women.