In the first step, the Alpecin Double Effect Caffeine Shampoo loosens scaly, horny cells and thoroughly removes dandruff from the scalp. This clears the way for the caffeine complex which remains on the scalp for up to 24 hours and promotes thicker, stronger hair.
1st Effect: Loose dandruff is removed and the scalp feels fresher and cleaner.
2nd effect: Caffeine travels along the hair making it appear thicker and stronger.