I've always wondered this:
Is there a reason everyone's hung up on only BCAA's during a workout??
Why don't we take a full-spectrum amino acid supp. Like ON's amino or twinlabs amino fuel, etc. wouldn't it be better to take a full spectrum of amino acids during workout than just the 3 branched-chain aminos?
Nitrogen balance in a nutshell. Luecine is the most critical to supplement with, and Valine and isoluecine being second. Everything else is debatable on whether or not it needs supplemented with a proper diet.