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Arginine is a conditionally essential amino acid which means that the body is able to produce it but an outside source may be required depending on the health or age of the individual. Arginine is important both for its role in bonding to other amino acids to form proteins and in its role as a precursor to the formation of nitric oxide (NO). NO is an important vasodilator. Arginine has also been shown to play a role in the release of growth hormone.

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