PKU Easy Shake and Go 34 Gram,Orange/Citrus Flavor, 125 Calories Per Bottle. PKU Easy Shake & Go is a Blavored phenylalanine free protein substitute containing essential and non-essential amino acids, carbohydrate, vitamins, minerals and trace elements. PKU Easy Shake & Go is suitable to be used in the dietary management of PKU patients aged 3 years and above.