Plantur 21 #longhair increases your chance of even longer hair. A daily supply of caffeine and micronutrients such as biotin, zinc and magnesium gives the hair roots a real energy boost so that they can keep active for longer to enable longer hair growth. The Nutri-Caffeine Shampoo contains conditioning agents such as soft cashmere that repair and nourish stressed and damaged hair. The shampoo is also free of silicones.