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 young children with documented tyrosinemia . Increased levels of B vitamins, compared to routine infant formulas, for cofactor production. Improved taste; sucrose (table sugar) has been added to neutralize the taste of amino acids. Mixes easily and stays in suspension well. Can contains 454 grams of phenylalanine- and tyrosine-free iron-fortified powder.