Casein

Some individuals may be susceptible to A1 beta-casein.

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T. Colin Campbell, PhD: Link Between Dairy Protein, Casein, & Cancer

Casein is a family of related phosphoproteins that are commonly found in mammalian milk, comprising about 80% of the proteins in cow's milk and between 20% and 60% of the proteins in human milk . It's the stuff that gives milk its white color.

Casein is a complete protein, meaning it contains all nine essential amino acids that your body needs but cannot produce on its own. It is also slow-digesting protein, which means it provides a sustained release of amino acids into the bloodstream. This can help to promote muscle growth and repair, and also help you feel fuller for longer.

Casein is found naturally in milk and dairy products, such as cheese and yogurt. It is also available as a dietary supplement in powder form. Casein protein powder is a popular choice among athletes and bodybuilders because of its slow-digesting properties.

Neutrophil activation can happen in some individuals when eating dairy casein. This is associated with food intolerance.