Alpecin Caffeine Liquid. Helps to support hair root activity. The caffeine-containing active ingredient combination helps to keep your hair roots awake. When applied it causes a fresh tingling on the scalp; its active ingredients travel along the hair shaft and form a depot sufficient for up to 24 hours. Application: Apply in the morning and after each hair wash to the towel-dried scalp and massage in. Do not rinse out. Allow to dry briefly then comb hair again. Style as usual. For best results use after Alpecin Caffeine Shampoo. (Information for competitive athletes: Alpecin Caffeine can be detected in hair follicles.)