What Is It: This is the same award winning Xtend formula with all natural flavoring, natural colors, and natural sweeteners.
How It Works: Nearly all of the reputable peer-reviewed studies that have highlighted the effectiveness of BCAAs — along with most of the anecdotal information that has sprung forth from the hardcore weight rooms — have investigated a 2:1:1 Leucine to Valine to Isoleucine formula. So despite a starring role for Leucine, Valine and Isoleucine are still vitally important to a multitude of the physique benefits that come from BCAAs.
One noteworthy study investigated muscle protein synthesis from either Leucine on its own or from BCAAs at a 2:1:1 ratio. College-age, recreationally-trained male participants received a straight Leucine supplement, a 2:1:1 BCAA supplement, or a non-caloric placebo before and after a leg workout. As to be expected, Leucine performed better than did the placebo, but the 2:1:1 BCAA ratio bested them both.