Brand from Germany: Alpecin. The caffeine leave-in liquid from Alpecin activates your hair roots with the help of the proven caffeine complex and stimulates hair growth. The special formulation delays age-related hair loss and also leaves a pleasant and fresh tingling sensation on the scalp.By applying it directly to the scalp, the caffeine complex is applied directly to the hair root and is effective for up to 24 hours. In addition, ingredients such as zinc and niacin stimulate hair growth and significantly delay premature hair loss.How to use:Use the dosing tip to apply the liquid to the towel-dried hairline in the morning and after each hair wash and massage it into the scalp. Do not rinse afterwards, but style as usual.