Are A1 and A2 both cow milk?

This article takes a detailed look at the science behind the A1 vs A2 milk debate. ... A1 beta-casein: Milk from breeds of cows that originated in northern Europe is generally high in A1 beta-casein. A1 milk comes ... Regular milk contains both A1 and A2 beta-casein, but A2 milk contains only A2 beta-casein. read more

A2 Beta-casein: From breeds of cows that originated in Channel Islands and Southern France such as Guernsey, Jersey, Charolais, Limousin. Dairy herds in much of Asia, Africa, and part of Southern Europe remain naturally high in cows producing A2 milk, the A1 version of the protein is common among cattle in the Western world. read more

Regular milk contains both A1 and A2 beta-casein, but A2 milk contains only A2 beta-casein. Some studies indicate that A1 beta-casein may be harmful, and that A2 beta-casein is a safer choice. This is the reason for the"A1 vs A2" debate. read more

Each cow carries two copies of the gene encoding beta-casein, with a genotype of A1/A1, A1/A2, or A2/A2. Neither the A1 nor A2 trait appears to be dominant, which means that the milk produced by an A1/A2 cow will likely contain equal proportions of A1 and A2 beta-casein. read more