Which Protein Powder Does The Body Use Best: WHEY or CASEIN?

When you ask a question like this, what you are probably interested in is Biological Value (BV) of the protein source. However, there is also a whole slew of other formulae to assess various other protein attributes.[1]


The two applicable measurements of BV that are currently in vogue are:

  • Protein Digestibility Corrected Amino Acid Score (PDCAAS)[2] ;
  • Digestible Indispensable Amino Acid Score (DIAAS)[3]

Neither of these rating systems directly addresses questions of either the rate of absorption or the efficacy of the protein source (how effective the protein source is in actually building muscle), but we certainly can make inferences from the information that they do supply.

What they both attempting to measure is to what extent the body (including its microbiome, if the PDCAAS method is used) has absorbed a protein source, i.e the initial amount minus how much of the initial protein mass is leftover to be excreted.

The answer to this query will also be the answer to the question you have posed here.

The quick answer to this is:


Whey is digested to a fuller extent than Casein.


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