TYROS 1 Non-GMO Category 1 Metabolic Powder, 2270 calories per 1 pound (454 g) can, 16.7 grams protein equivalent per 100 grams of powder, vanilla scent. TYROS 1 is an iron-fortified infant formula and medical food powder that is free of the essential amino acids phenylalanine and tyrosine for infants and toddlers with documented tyrosinemia. This product provides all other essential amino acids as well as nonessential amino acids, carbohydrate, fat, essential fatty acids, vitamins and minerals. Use under direct and continuing supervision of a doctor.