It is commonly assumed that symptoms experienced after consuming regular milk are due to lactose intolerance. Some people may actually have a sensitivity to the A1 protein and not lactose itself.​

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A1 and A2 are beta-casein problems, a form of the casein protein found in milk.

A1 and A2 proteins are known to affect the body and digestion differently.

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People who are known to be lactose intolerant are reporting that they have an easier time digesting milk/milk products that are produced with only the A2 protein.