Abstract: Protein-containing conditioning drink on the basis of a mineral- and vitamin-enriched fruit juice beverage, which consists of a content of 30 to 90 wt. % of a fruit juice or of a mixture of different fruit juices corresponding to a content of 4 to 20 wt. % of solids, a content of 2 to 20 wt. % of a liquid whey concentrate corresponding to a whey protein content of 1.2 to 5 wt. %, whose lactose content is enzymatically cleaved, and/or of partially hydrolyzed soya protein, as well as a natural flavor adjustment flavoring, plus mineral salts and added vitamins, and has a pH between 4.0 and 5.0, preferably of pH 4.2 to 4.4.