Alpecin Caffeine Shampoo is designed to help fight against the effects of hair loss and promote hair growth. It works by the active ingredient caffeine stimulating the root of the hair. Alongside the caffeine, there are two other active ingredients that help to fight against dandruff. The ingredients, salicylic acid and piroctone olamine, help to loosen scaly cells and dandruff on the scalp. This shampoo doesn’t just remove dandruff but also protect against it returning.