Macro Nutrition EAA Plus is the ultimate intra-workout supplement. Our bodies are unable to synthesize essential amino acids, so we should include them in our diet. You take essential amino acids (EAAs) to stimulate growth or preserve muscle mass. To make this product more complete, our Amino EAA Plus contains 2g of citrulline per serving, which will help increase nitric oxide in your body. We also add 2g of HMB.