Protein powders

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So, the consensus is that whey isolates or the more expensive brands are in fact superior?

Brand is important because well established companies have a reputation to maintain. Most perform independent verification to make sure their products contain the quantities and purities they list.

Whey isolate is the best because it has the highest biological value number.

You can read more on this here:

How to Build Muscle Fast: Biological value (BV) Are All Protein Sources The Same