Avoid hair loss. With its unique formula and complex of caffeine, zinc and niacin, Alpecin C1 Caffeine Shampoo supports natural hair growth. Alpecin is the best-selling hair care brand for the prevention of hair loss in men in Germany with proven scientific efficacy. Stimulates hair roots during washing. Caffeine penetrates hair follicles in just 120 seconds and strengthens fine, weakened hair. For our anti-hair loss shampoo for men we have deliberately avoided softening silicones to facilitate combing. How to use: Use Alpecin men's hair loss shampoo daily. Leave on the scalp for at least 2 minutes, for best results then rinse well.