Alpecin Caffeine Shampoo C1
Questions and answers
In principle, the longer you leave the shampoo on the scalp, the more intensive the effect of the caffeine. However, this may increase the risk of scalp redness especially for sensitive scalps. Therefore, you should pay close attention to how your scalp reacts when you leave the product on longer. Normally, 2 to 5 minutes should be enough to activate the hair.
With regard to the hair wash, the quantity of caffeine absorbed by the body is about one-fifth of a cup of coffee or 50 ml of Coca-Cola. This is completely safe, even for people who react sensitively to caffeine.