Kirkland Signature Hair Regrowth Treatment Extra Strength for Men, 5% Minoxidil Topical Solution, 2 fl oz, 6-pack (6) 2 fl oz. Topical Solution 5% Minoxidil Hair Regrowth Treatment Compare to Men’s Rogaine Extra Strength active ingredient. Don’t let thinning hair get you down. Kirkland Signature Minoxidil Topical Solution USP, 5 Percent is an extra strength topical hair loss treatment used to help regrow hair on top of the scalp (vertex only). This unscented product reactivates hair follicles to stimulate regrowth and is clinically proven to help regrow hair. It is not intended for frontal baldness or receding hairline. Minoxidil is the number one dermatologist recommended active ingredient (of U.S. physicians surveyed by an independent market research firm). This product is not intended for use by women. Features an easy to use dropper.