Caffeine promotes hair growth and can even noticeably slow down hereditary hair loss. This unique active ingredient can now be delivered to the hair roots even during daily hair washing. Alpecin caffeine penetrates the hair shaft, even though the shampoo is rinsed out. In a short time, the active ingredient travels directly to the hair follicle along the hair shaft. If the shampoo is left on the scalp for a longer period, the caffeine also penetrates through the skin. Additionally, men can benefit from this shampoo as it improves hair structure by consciously avoiding softeners. After just a few washes, the hair becomes more manageable. Fine and weakened hair becomes stronger and easier to style.