@Hyperhidrosis @WandererUber @mangeurdenuage There should be no taste difference between A1 and A2 milk, as I figure such a small change in the Casein would have no noticeable taste (although cows fed different food results in different tasting milk).

Digestion of casein from both A1 and A2 milk can form opioid peptides, although A2 milk produces less β-casomorphin 7; https://en.wikipedia.org/wiki/Casomorphin?useskin=monobook

It appears that there is ~10mL of Casein per Liter of milk, which I figure results in trivial amounts of opoids (which explains why studies found no negative effects of drinking A1 or A2 milk).

A2 milk still contains A1 protein, although just less of it.

As far as I can tell, the A2 milk company is just peddling snakeoil, but at least the snakeoil is harmless.