With its caffeine-containing active ingredient combination, Alpecin keeps the hair root awake and helps to extend its growth phases longer than hereditarily intended: Counteracts the premature loss of hair. Increases the productivity of the hair root. The growth rate of the hair increases. When applied, it leaves a fresh tingle on the scalp, its active ingredients run along the hair shaft and form an active ingredient depot that lasts up to 24 hours.