The nutri-caffeine complex in Plantur 21 helps to prevent an energy deficit in the hair roots. The caffeine in Plantur 21 primarily slows down degradation of the important energy carrier cAMP. It can be detected at the hair root after just 120 seconds. An additional effect comes from the valuable micro-nutrients biotin, magnesium, calcium and zinc. They are important factors for healthy and vigorous hair growth. The Nutri-Caffeine Shampoo has also been developed for colour-treated and stressed hair. It contains conditioning agents that repair the externally stressed hair. This represents no burden on the hair, since no silicones that weigh down the hair are used.