A2 beta-casein protein explained

What is beta-casein?

There are two main groups of protein in cows’ milk: whey (around 20% of total protein) and casein (around 80% of total protein).

Beta-casein is one of the 3 major casein proteins in milk (Fig: 1) and makes up about one third of the total protein in milk. It transports essential minerals and nutrients such as calcium and phosphorous and provides important materials for building strong muscles, bones and other body tissues.

Fig: 1. The composition of milk, including the 3 major casein types (beta-casein makes up about 30% of total milk protein).

There are two main types of beta-casein, called A1 and A2. These are produced by cows’ based on their genetic ability to produce one or the other. A2 is recognised as being the original or ancestor beta-casein gene in dairy cattle. A1 beta-casein protein is a different protein that is now commonly found in cows’ milk. A1 developed following a genetic mutation in some European dairy herds several thousands of years ago. The A1 and A2 type proteins differ by only one amino acid. This difference in protein composition between the A1 and A2 type of beta-casein may affect how these proteins are broken down during digestion.

a2 Platinum® is based on a unique protein blend suited to babies, because it is the first and only Infant Formula and Toddler Milk Drink where the naturally occurring beta-casein protein comes from cows’ specially selected to produce the A2 beta-casein protein type exclusively, rather than A1 protein.

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