Its made from milk yes but its been fairly well treated since it was that stage, not quite the same as having a carton in the fridge out of date by 3 years. Its pure isolate so stripped of fat etc and ionised. I know the dates are there for a reason but thats generally to safeguard makers and good will be OK long after that date. Its only powder, how badly can it go off? or what germs can form on it?? Genuine questions as I just dont know.

For the sake of a few quid its going in the bin anyhow.