Often I see protein blends on the packaging of supplements. Something like, "This product contains a blend of whey protein isolate, whey protein concentrate, etc...".
So my question is, how do we know how much isolate is in the container. We know that the flavouring, carbs, added vitamins, etc are fillers. But how do we know if they put 90% of the protein in there concentrate and only 10% isolate?


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