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PKU express® is a concentrated, powdered PKU protein substitute which when mixed with water is easily made into a drink. The volume can be adjusted to your own preference.

What is PKU express?

PKU express is a concentrated, powdered PKU protein substitute which when mixed with water is easily made into a drink. The volume can be adjusted to your own preference. PKU express is available in two sachet sizes:

  • PKU express15 contains the equivalent of 15 grams of protein
  • PKU express20 contains the equivalent of 20 grams of protein

Both sachet sizes also contain all the vitamins and minerals that are needed to help meet your daily nutritional requirements.

Who is PKU express for?

PKU express is for children and adults with PKU. It is suitable from 3 years of age onwards and can be taken through to adulthood.  Your dietitian will advise when is best for you or your child to move on to PKU express. Although PKU express is suitable from 3 years of age it is often introduced at school starting age or later if needed.

Why do I need to use PKU express instead of continuing with a second stage protein substitute?

As we grow our nutritional requirements change, and this is no different for those with PKU. Vitaflo products are tailored to meet these requirements in the most efficient way. Vitaflo want to make sure the right product is available at the right time to meet your protein, vitamin and mineral requirements.


PKU express meets nutritional needs in older children and adults and can replace the second stage protein substitutes, such as PKU gel or PKU squeezie. PKU express is more concentrated than PKU gel or PKU squeezie, so taking the recommended amount is easier.

How much PKU express do I need?

The amount of PKU express needed will depend on a variety of factors including age and weight. Initially, the amount needed may only be small but it will increase as you get older to support growth. Your dietitian will advise exactly how much PKU express will be needed each day.

How do I make PKU express?

Making PKU express is easy!  The great thing about PKU express is that it can be made in a variety of ways. Below are instructions of how to make PKU express up in three different ways to give you an idea of how to use it. But remember it’s your product; you can make it however you want!


PKU express ‘paste’…. A few spoonfuls and it’s gone

  1. Empty the contents of the sachet in to a beaker.
  2. Add 10ml of water if using PKU express15 or 20ml of water if you are using PKU express20
  3. Secure the lid on the beaker and shake well for 10 seconds.
  4. Consume with a spoon.*


PKU express ‘mini’ drink…Great if you want to take it quickly
Follow the steps above but add 80ml of water if using PKU express15 and 100ml of water if using  PKU express20*


PKU express ‘flexi’ drink… Make it to your own taste and volume

  1. Follow the steps to make express paste but add as much water as you like to begin with and over time find the best volume that suits you*

*Remember water or another permitted drink should be taken straight after PKU express.

What flavour is PKU express?

PKU express unflavoured can be flavoured using your own permitted flavourings or Vitaflo’s separate flavour pac sachets which are available in blackcurrant, orange, raspberry and tropical flavours.

What if I would prefer to take a ready-to-drink product?

PKU express is a powdered protein substitute, which is great if you want the flexibility to make your protein substitute to your own preference. If you prefer convenience, and would like to use a liquid protein substitute click on PKU cooler and PKU air on the VitafriendsPKU product journey for more information about Vitaflo’s ready-to-drink products.

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Join the Vitafriends PKU Facebook page to get support from others with PKU.

Other useful bits of information

Use the 'Useful Resources' section above to view our express recipe book which has lots great ideas about how to make up express using permitted drinks.


PKU express is a food for special medical purpose, and should be used under medical supervision.

Useful resources

Explorers Club

If you haven’t done so already, why not register for the Vitafriends Explorers Club – an education programme for families managing PKU in the early years.

It’s packed full of recipes to help with the introduction of solid foods!