Compare every Casein Protein product across UK retailers on Suppio, ranked by true value - price per serving, not pack size. Prices refreshed daily.
What it is
Casein protein is a type of protein found in cow milk. It is specifically sold as micellar casein, which means the protein is structured in small clusters called micelles that take a long time for the body to break down.
Why it's used
It is used to provide a sustained release of amino acids, which are the building blocks of protein, into the bloodstream. Because it digests slowly, people often use it before sleep to prevent muscle breakdown during the night.
How it compares to Whey Protein
While both come from milk, they behave differently in the stomach.
Feature
Casein Protein
Whey Protein
Digestion Speed
Slow
Fast
Stomach Effect
Forms a gel that slows digestion
Liquid that absorbs quickly
Best Use Case
Long periods without food (e.g. overnight)
Immediately after a workout
How it's made
Manufacturers separate casein from milk using an acid or an enzyme to make the protein clump together. This solid curd is then filtered, dried into a powder, and processed into a fine consistency for mixing.
What it typically costs
This supplement is generally mid-range in price. This is because the filtration process required to isolate the micellar structure is more involved than basic protein processing, but the raw milk source remains widely available.
How Suppio ranks
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
Prices across our retailer network are refreshed at least daily.
Suppio matches identical products across UK retailers by barcode, then ranks by price per active dose rather than sticker price. Value rankings only ever include listings Suppio has independently verified against the live retailer page - unverified data is shown on each product’s own page but excluded from ranking.
How often are Casein Protein prices updated?
Prices across our retailer network are refreshed at least daily.