Casein protein is a protein in milk that gives milk its white color. Cow's milk is made up of around 80% casein. When people drink milk, the body breaks casein down into smaller pieces called casein peptides. Casein peptides can also be made in the laboratory and marketed as dietary supplements. Casein peptide products might be called "casein hydrolysate" or "hydrolyzed casein protein" on the label.

Casein peptides are most commonly used for atopic dermatitis (eczema) and allergies to milk. They are also used for high blood pressure, high cholesterol, anxiety, and many other conditions, but there is no good evidence to support most of these uses.

How does it work ?

Some casein peptides are thought to cause blood vessels to enlarge in diameter and therefore lower blood pressure.

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