Sorry if Im explaining it badly - Yes Casein will normally contain a form of vitamin A unless the mother is living on a very low vit A diet. But just like with PUFA there is also specie difference, camels milk are much lower naturally then say cowsmilk and goats milk is even higher. It is problematic even with camel if your detoxsystem isnt good.so the casein in milk contains vitamin A? how much A does it contain?
so whey powder would truly have 0 vitamin A?
No, whey is milk protein and is thus very high vitamin A though a different but equally problematic form then the ones they usually test for in foods, thus the erroneous labelling of low/zero A. Whey is thus worse the milk due to the concentration. Unfortunatly I dont know the exact typical amount in say cows whey.