During high-intensity exercise the muscles consume a lot of energy and the body saves energy elsewhere. Alpecin Sport Caffeine Shampoo is suitable for men who are physically active. Thanks to its special active ingredient combination – Alpecin Caffeine, taurine and the micronutrients biotin, zinc, magnesium and calcium – it recharges the hair. Leave Alpecin Sport Caffeine Shampoo on for 2 minutes.