PKU trio, Unflavored, Powder, 400g (14.11 ounce) Can. 405 calories per 100g of powder. 1620 calories per can. PKU trio is a powdered phenylalanine free medical food containing a blend of essential and non-essential amino acids, carbohydrate, fat, vitamins, minerals and trace elements. Available in unflavored and vanilla flavored options. For use in the dietary management of Phenylketonuria (PKU). Suitable for individuals from 1 year of age through to adulthood.