Alpecin Caffeine Shampoo C1 250mlAlpecin Caffeine Shampoo C1 250ml Caffeine helps to maintain healthy hair growth. Now you can transport this unique active ingredient to the hair roots during your daily hair wash. Alpecin Caffeine penetrates even though the shampoo is rinsed out. In just a short time (120 sec.) the active ingredient travels along the hair shaft directly into the hair follicles. If the shampoo is left on for longer the caffeine will also penetrate into the scalp. But