The caffeine-containing active ingredient combination keeps hair roots awake and contributes to extending their growth phases for longer than provided for by hereditary predisposition: counteracts premature hair loss increases hair root productivity enhances the speed of hair growthwhen 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.