Thank you Mr. Rogers. Both are proteins found in the casein family. Cow’s milk consists of 80 percent casein protein, which provides the human body with all the amino acids it needs to build healthy muscle. Casein is a superior form of protein. The body digests it more slowly than other proteins, which can make it more effective at reducing appetite.

Both contain 209 amino acids. As I already mentioned, where they differ is in the 67th amino acid in the chain. A1 milk has a histidine amino acid, whereas A2 milk has a proline amino acid. Why does this matter? Well, when A1 milk breaks down during digestion, it creates the peptide BCM-7. Peptides can impact our blood pressure, immune system, and even how our blood clots. It also can cause what some people like to call “intestinal discomfort.”

A2 milk is bio-available, which means the human body can absorb lots of it without unpleasant side effects. It also does not have the penchant for creating BCM-7.

All cows produce some A2 beta-casein, but only a few breeds produce only A2.