- Alpecin Grey Attack is a caffeine shampoo designed for men who want to gradually and naturally darken their hair - Its advanced formula helps visibly reduce gray hair and adds more volume to the hair - Allows you to control the color intensity through exposure time and frequency of use - Noticeable results after 2 to 4 weeks of daily use - Strengthens hair thanks to its combination of caffeine, panthenol, and niacinamide - Easy to use: apply to the scalp, leave on for 2 to 5 minutes, and rinse - Alternate with your regular shampoo to maintain the achieved tone - Suitable for any hair color, especially effective on light brown to black shades - Presented in a 200 ml container, practical and easy to use