When it comes to maintaining and building 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 nutrition sources. R1 Essential Amino 9 Energy delivers 7.5g of all 9 EAAs with tea leaf for energy and added electrolytes for hydration.“So delicious! Really good support for muscle recovery! I use it two times a day.R1 Essential Amino 9 provides essential amino acids (EAAs) plus electrolytes to help support muscle recovery and hydration without stimulants.With all 9 EAAs, 4 electrolyte minerals, zero stimulants, and a variety of thirst-quenching flavors to choose from, our Essential Amino 9 works well during and after workouts.