BCAA supplements are almost pointless if you consume a good source of protein. The excess BCAAs are actually counter productive. While leucine is the "signal" amino acid for increases in protein synthesis, taking it with out all of the other essential amino acids will cause a decrease in the intracellular AA pool, reducing protein synthesis.
There is also no evidence that they decrease fatigue or muscle loss during a workout due to protein catabolism.
You are better off eating a whole protein before and after working out than taking BCAAs alone or in combination with proteins.
(see pubmed.com, author Rennie, MJ; Tipton, KD; Borsheim (sp), Wolffe, RR
This is what someone told me.