ok, you make an interesting point.

I had read though that for whey protein to be effective in raising glutathione it must be kept unheated and unaltered at all times during the manufacturing process as this protects the main proteins that supply cysteine, which is deemed the most essential of the three glutathione precursors. However, when the whey protein becomes heated/ denatured it loses a lot of these things...

If the protein enters your body though, presumably the stomach needs to allow it into the body without destroying it? Im sure im probably missing something...