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Dark berries and fruits contain various secondary plant substances. Unlike fats, proteins and carbohydrates, these substances have no nutritional value for us - thus ‚secondary’ - but perform another important task: In the wild, they protect from natural enemies and environmental stress, such as solar radiation (UV light). Colourants that give berries their dark red, blue and also violet-black colour belong to the group of secondary plant substances. Also certain bitter compounds which are for example present in green tea and grape seeds. They all have in common that they belong to a major group of plant substances: The polyphenols. Berry.En has formulated a ready-to-use gel that contains valuable polyphenols.