Alpecin tuning shampoo containes caffeine for hair roots and can also help strengthen your natural hair colour for dark blonde to black hairr r r alpecin tuning shampoo fortifies the natural hair color and tints initial grey hairs with age the hair roots increasingly lose their ability to form the coloring melanin pigments so that the hair shaft becomes white as more hairs become white the hair will look more and more grey based on the intensive pigments in this shampoo using alpec