Now you can transport the unique active ingredient of Caffeine to the hair roots during washing. Alpecin Caffeine Shampoo penetrates the scalp even when the shampoo has been rinsed out. In just 120 seconds the active ingredient travels along the hair shaft direct to your hair follicles. The shampoo doesn't contain any softeners (eg. hair silicone) so it also helps to improve the hair structure after just a few washes. Fine and weakened hair becomes stronger and can be styled more easily. Use daily for best results. Ensure that the shampoo is left on the scalp for 2 minutes before rinsing to ensure that the caffeine is fully absorbed into the hair foilcles.