beta1and2

A2 milk is a variety of cows' milk that mostly lacks a form of β-casein proteins called A1, and instead has mostly the A2 form. Cows' milk like this was brought to market by The a2 Milk Company and is sold mostly in Australia, New Zealand, China, the United States, and the United Kingdom. Non-cow milk, including that of humans, sheep, goats, donkeys, yaks, camels, buffalo, and others, also contain mostly A2 β-casein, and so the term "A2 milk" is also used in that context.The a2 Milk Company claims that milk containing A1 proteins is harmful, and some companies producing goat's milk products make similar claims, but a 2009 European Food Safety Authority (EFSA) review found that it could not be established that bioactive peptides in milk containing both the A1 and A2 proteins have an adverse effect on health.A1 and A2 beta-casein are genetic variants of the beta-casein milk protein that differ by one amino acid. A genetic test, developed by the a2 Milk Company, determines whether a cow produces A2 or A1 type protein in its milk. The test allows the company to certify milk producers as producing milk that does not metabolise to β-casomorphin 7 (BCM-7)."A2 MILK" is a trademark of the a2 Milk Company in multiple countries, including the United States.

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