Alpecin Caffeine is very well detectable after being left on for as little as 120 seconds. If left on for longer, more caffeine will be absorbed into the scalp. Alpecin Caffeine penetrates even though the shampoo is rinsed out. In just a short time (120 sec.), caffeine 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. This shampoo does not contain any conditioning agents so your hair will immediately have more grip.
