The Evidence

A1 and A2 beta-casein

Beta-casein comprises 30% of the protein content in cows’ milk and regular milk contains both A1 and A2 beta-casein. These digest differently to one another due to a slight difference in the amino acid sequence on the peptide chain. Upon digestion, A1 beta casein releases beta-casomorphin 7 (BCM7) whereas A2 beta-casein does not.

Research Studies

There is an extensive body of scientific literature made up of over 100 independent, peer-reviewed studies that underpins A1 beta-casein digestion, the release of BCM-7 and its subsequent health effects. The a2 Milk Company are committed to building upon this evidence base.

Below you will find summaries of studies into the A1/A2 beta-casein digestive differences as well as links to the original papers.

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