Pure Encapsulations Amino-NR 180 CapsulesAmino NR Natural ratio amino acid complex Amino NR is a complex of amino acids in naturally occurring ratios, providing benefits for daily wellness. Amino acids are the building blocks for all proteins, making them essential for a number of body functions, including fluid balance, enzyme production, cellular repair, and energy metabolism. In everyone from trained athletes to the elderly, amino acids play an important role in muscle protein synthesis.