alpecin double effect caffeine shampoo is designed to solve two common hair problems: dandruff & hair loss. first it works to gently exfoliate the scalp, removing dandruff & relieving itchiness. then its caffeine complex helps strengthen the hair roots, counteracting hair loss & producing stronger, thicker hair. alpecin double effect caffeine shampoo has an anti-inflammatory action to soothe the scalp, as well as antimicrobial properties & an antioxidant effect for increasingly resistant hair. the result of more than eighty years of hair care research, alpecin double effect caffeine shampoo also contains zinc & niacinamide for healthy hair roots, & is free from any softening silicones. alpecin double effect caffeine shampoo can be used every day. just massage into the scalp & leave on for two minutes before rinsing thoroughly. for more details, please read the instructions on the bottle. competitive athletes please note: alpecin caffeine can be detected in hair follicles., removes dandruff, relieves itchy scalp, strengthens & thickens hair