A crystalline amino acid solution provides crystalline amino acids to promote protein synthesis and wound healing, and to reduce the rate of endogenous protein catabolism. Amino Acids given by central venous infusion in combination with concentrated dextrose, electrolytes, vitamins, trace metals, and ancillary fat supplements, constitutes total parenteral nutrition (TPN). Amino Acids can also be administered by peripheral vein with dextrose and maintenance electrolytes.