PKU cooler10 10g Protein equivalent PKU cooler15 15g Protein equivalent PKU cooler20 20g Protein equivalent 87ml 130ml 174ml is a convenient, low volume, ready-to-drink protein substitute for PKU. All five PKU coolercolours are a blend of different flavours, try all of them to see which is your favourite! PKU cooler is available in three pack sizes (10g, 15g and 20g protein equivalent) so there’s no need to change product once you are taking PKU cooler you can simply move up the pack sizes as your requirements change as you grow up. cooler yellow ™ cooler red ™ cooler purple ™ cooler orange ™ cooler white ™ PKU cooler is easy to take, simply shake and drink! If you like more than one colour, you can mix ‘n’ match your favourites each day! There’s a colour for everyone