Prevents hereditary hair loss. Stimulates and strengthens weakened hair roots already during washing - for noticeably more hair.Caffeine penetrates into the hair follicle (detectable after 120 seconds of exposure), activates the hair roots and extends the growth phase to its natural length. Zinc and niacin are important growth factors for healthy hair roots. By deliberately avoiding emollients (e.g. silicone), the hair gets more grip. Fine and weakened hair becomes stronger and can be styled better.With the exposure time, the caffeine absorption in the scalp increases. Recommendation: Leave on the scalp for 2 minutes - from application to rinsing.