I have sensitive skin. How long can I leave the Caffeine Shampoo on the scalp?
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.