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Body builders have long used high-protein diets and amino acid supplements in programs designed to increase muscle mass. Now researchers have found that young and elderly subjects who consumed 15 g of essential amino acids showed an increased synthesis of new muscle protein. Researchers concluded that "amino acid supplementation acutely stimulated muscle protein synthesis in both young and elderly individuals."
Am J Physiol Endocrinol Metab 286(3):e321-e328