Strength, endurance, and recovery are all key elements of your workout regimen. Leucine, Isoleucine and Valine are the three branched chain amino acids (BCAA's). BCAA's account for the highest percentage of amino acids in human muscle tissue. Clinical trials show that athletes fatigue more slowly and perform at a higher level when taking BCAA's, L-Leucine is the most active and is found at the highest concentration in the muscle. Vital Aminos contains over 3.5x more L-Leucine than Isoleucine and Valine. This blend ensures even greater results than the standard 2:1:1 ratio typically found in other formulas. There are no fillers or unnecessary ingredients like Taurine or Glycine in Vital Aminos and it tastes GREAT.