Phenyl-Free 1 Milk Powder 1 LB Can, 2,270 calories per can. Phenyl-Free 1 is an iron-fortified infant formula and medical food powder that is free of the essential amino acid phenylalanine for infants and toddlers with documented phenylketonuria (PKU). 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.