• Darkens hair gradually and naturally, suitable for any hair color, ideal for light brown to black hair. • Controls color intensity through application time and frequency. Visible results after 2-4 weeks of daily use. • Easy to use: lather on the scalp, leave on for 2 to 5 minutes, and rinse. Use daily until the desired result is achieved, then alternate with a regular shampoo. • Strengthens weakened hair with its unique formula of caffeine and other active ingredients, promoting natural hair growth. • The best-selling shampoo in Germany for combating weakened hair in men. • Product dimensions: 7 cm wide, 15.5 cm high, 4.5 cm long.