Alpecin Grey Attack Caffeine & Colour Shampoo offers our best for men turning grey: the possibility to make hair darker and stronger. It just takes two to five minutes in the shower and no additional product or steps are needed. Anti-grey shampoo with repigmentation technology The innovative repigmentation technology is based on a patent-pending active principle: the active ingredient 5,6-DHI accumulates in the hair during washing and reacts with the oxygen in the air to form the colour pigment. As a result, the hair gradually becomes darker. A permanent hair colour develops that grows out with the hair. Proven caffeine complex for stronger hair In addition, the well-known caffeine complex supports natural hair growth. Hair immediately has more grip and can be styled better without softening silicones. Application Wet the hair and massage into the scalp and hair. Leave the shampoo on for 2 to 5 minutes - from application to rinsing off. A longer application intensifies the colour effect! Use daily until the desired colour result is achieved. Then it can be alternated with other Alpecin shampoos.. Suitable for any hair colour - best for light brown to black hair.