Amino acids for medical purposes, separately or in combination; balanced supplementary dietetic products and balanced supplementary dietetic products, namely, dietetic foods for special medical purposes adapted for the treatment of phenylketonuria; dietetic products for medical purposes, namely, foodstuffs, food supplements and beverages adapted for medical purposes; dietetic substances, namely, protein supplements, vitamin supplements, mineral supplements, dietary supplements, and food supplements for medical purposes; dietetic foods adapted for medical purposes; protein-based products, namely, dietary supplements and dietetic products in the nature of dietetic foods adapted for medical purposes containing modified milk proteins, modified proteins of vegetable and animal origin, biotechnologically produced proteins and recombinant dietary proteins for medical purposes; protein-based food supplements for medical purposes with the addition of amino acids, carbohydrates, lipids, vitamins, minerals and trace elements; diagnostic preparations for medical purposes; amino acids for veterinary purposes