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- Nov 15, 2006
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Here are 2 interesting studies showing higher ammonia levels after ingesting BCAA's, moreso than when consuming whole proteins:
pubmed.ncbi.nlm.nih.gov
Here is also a good read from Lyle McDonald:

Effects of supplementation with branched chain amino acids and ornithine aspartate on plasma ammonia and central fatigue during exercise in healthy men - PubMed
Supplementation with BCAA and OA is a useful way to improve MCRT during high-intensity exercise and accelerate the elimination of ammonia at the recovery stage after exercise in healthy young men.

Here is also a good read from Lyle McDonald: