NATURAL HAIR GROWTH: This shampoo cleanses the scalp to promote natural hair growth., THICKER, STRONGER HAIR: Caffeine, zinc, and niacin work together in this men's shampoo to recharge your thinning hair for a thicker, stronger, fuller feel., ENERGIZE AND RECHARGE: With caffeine and castor oil, this shampoo recharges and energizes the strands for a fuller-looking head of hair., FIGHT FOR YOUR HAIR: Daily use of our Alpecin shampoo helps promote natural hair growth and keeps your hair looking and feeling thick and full., GERMAN ENGINEERING FOR YOUR HAIR: Decades of German research is infused into every bottle of our Alpecin Caffeine Shampoos.