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I disagree – Only taking L-leucine will cause an imbalance in other amino acids, L-isoleucine, and L-valine.

Also

“Glutamine is also a powerful cell volumizer (Haussinger et al. 1993). An increase in cell volume, also called cell swelling, stimulates many anabolic pathways (synthesis of protein and glycogen) and inhibits catabolic pathways (protein degradation) (Haussinger, 1996). Glutamine is a “nitrogen shuttle” between organs, a fuel for cells of the immune system and intestines, and a precursor for nucleotide synthesis (Holecek, 2002).

Ingestion of supplemental free-form glutamine or glutamine peptides is oxidized by the intestinal tract or taken up by the liver and kidney, all of which is beneficial but supplementing with BCAA can cause new synthesis of glutamine inside skeletal muscle (Houston, 2001).

The need for alanine and glutamine is increased during exercise is met by BCAA from muscle protein breakdown (Holecek, 2002). Increased muscle protein breakdown equates to muscle loss, which no athlete wants. By supplementing with BCAA, one can deliver the needed building blocks for both alanine and glutamine and spare muscle tissue.