<P> A2 milk is cow's milk that mostly lacks a form of β - casein proteins called A1 and instead has mostly the A2 form . Milk like this was brought to market by The a2 Milk Company and is sold mostly in Australia, New Zealand, China, United States and the United Kingdom . </P> <P> The a2 Milk Company claims that milk containing A1 proteins is harmful, but a 2009 European Food Safety Authority (EFSA) review found that there was insufficient evidence to prove that bioactive peptides in A1 milk have a negative effect on health . </P>

What is the difference between a2 milk and regular milk