Effects of milk containing only A2 beta casein versus milk containing both A1 and A2 beta casein proteins on gastrointestinal physiology, symptoms of discomfort, and cognitive behavior of people with self-reported intolerance to traditional cows' milk.
Nutr J. 2016 Apr 2;15:35. doi: 10.1186/s12937-016-0147-z. Nutr J. 2016. PMID: 27039383 Free PMC article. Clinical Trial.