BCAAs promote Muscle Growth and Recovery and the BCAA Leucine has the biggest impact on Gaining and Maintaining Muscle. Studies show that Muscle Recovery and Growth are increased with more leucine and decreased with less leucine and, to a lesser extent, the other BCAAs. Modern BCAA+'s 8:1:1 BCAA Ratio of Leucine:Valine:Isoleucine offers up to 8 Times More Leucine than some other BCAAs, so you Know Your Getting the Leucine you need!