When it comes to maintaining and developing new muscle mass, the nine essential amino acids are literally essential. This group of amino acids cannot be synthesized within our body they must be obtained from nutritional sources. R1 Essential Amino 9 offers 7.5g of the 9 essential amino acids with tea leaf extract for energy and additional electrolytes for hydration. 7.5 g of essential amino acids 5 g BCAA 500mg of added electrolytes 130mg tea leaf extract Carefully mixed and packaged in a GMP facility in the U.S.