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Also, it is important to mention that whey isolate does not have many of the health enhancing properties that are described above, as the expensive process required to produce whey isolate destroys many of the health/immune system enhancing sub-fractions such as the lactoferrins, beta-lactoglobulins, and immuno-globulins.
Therefore, for during the day use, a product consisting mainly of whey concentrate is your best bet while for after the workout, a whey isolate product would be a better choice.
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This, imo, is a good point. If whey has all or any or the benefits described, these constituents are likely where it comes from. For instance, whey powders being ueful for people with wasting conditions (one reason HIV sufferers use it) - it has been proposed that those sub-fractions have growth promoting effects.