Why double effect?The two most frequent scalp problems affect men: hair loss and dandruff. Dr. Wolff Research has developed a shampoo that simultaneously counteracts both problems: Alpecin Double-Effect Shampoo.1st effect:In the first step, this Double-Effect Shampoo loosens scaly, keratinous cells and thoroughly removes dandruff from the scalp. From a dermatological standpoint, the combination of the two effective anti-dandruff substances, salicylic acid and octopirox,is recommendable, because it takes into account all dermatologically relevant aspects of cosmetic dandruff:Gentle dandruff removal Anti-inflammatory action Antioxidant effect,i. e. improved resistance Antimicrobial properties In the past, this combination was exclusively used in pharmacy products as a dermatologically based anti-dandruff solution. It allows a precise and gentle micro-peeling (micro-exfoliation) and relieves scalp itch.2nd effect:The removal of dandruff from the scalp has prepared the way for the caffeine complex. Alpecin Double-Effect Shampoo contains highly dosed caffeine that penetrates into the hair roots already during hair washing. It can be detected after just 120 seconds of residence time. In the hair root, the active ingredient forms a 24-hour depot, thereby protecting the hair root from premature inactivity.