Phyto-Caffeine Shampoo, activates hair roots during washing. The caffeine in this shampoo prevents premature exhaustion of hair growth. When washing, the active caffeine ingredient penetrates all the way into the hair follicle, which can be detected after being left on for as little as 2 minutes. Plantur 39 Shampoo for Fine & Brittle Hair only contains a small amount of hair conditioning agents to ensure that your hair style retains its volume.