Optimum Nutrition Superior Amino 2222 320 TabletsAmino Acids are the building blocks of protein including proteins used to grow, repair, and maintain muscle tissues. Our Superior Amino 2222 Tabs provide a full spectrum 2,222 mg array of essential, conditionally essential, and non essential amino acids derived from a blend of isolated, concentrated, and hydrolyzed protein sources and fortified with additional Micronized Amino Acids. Bottom line: It is one powerful pill.