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Optimum Nutrition Glutamine - Glutamine is the most abundant amino acid in the body, comprising more than 60% of the free amino acid pool in skeletal muscle and greater than 20% of total circulating amino acids. Optimum Nutrition supplemental L-Glutamine may help reduce muscle soreness and rebuild muscle tissue. During prolonged periods of intense exercise glutamine levels can be depleted which may limit protein synthesis. ON Glutamine Powder is a simple way to supplement your diet with this amino acid. Just one table spoon of Glutamine Powder provides more glutamine than 4 jumbo eggs, 4 oz. of lean beef, ¾ cup of soybeans or a 4 oz. chicken breast. Because it’s unflavored and instantized for easy mixing, you can add the powder into fruit juice, protein shakes or your favorite weight gain formulaMade with Pure L-Glutamine.