21st Century L-Arginine 500Mg Plus 30'S Muscle & Joint 21st Century Muscle Builder and

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21st Century L-Arginine 500Mg Plus 30'S Muscle & Joint 21st Century Muscle Builder andL Arginine is a semi essential Amino Acid and is usually synthesised by adults to maintain body proteins. These can be depleted in times of stress. L Arginine is important for children especially during growth periods. It is also essential for the metabolism of ammonia that is generated from protein. Also essential for muscle metabolism.