whey is a by product from making cheese, then the whey is sorted out, the low end stuff called bakers whey is what gets sent to wollies and coles and even milk companys.
its usually only about 20% actual protein concentrate.
This is also bought and used by alot of the protein companys popping up online ect.
the better stuff getting used by the bigger brands is usually about 80% concentrate.
Probly the reason why companies can sell bulk aussie made powders for cheap.
though is anyone has more knowledge on this i would love to know