NOW Sports products are comprehensively tested so you can trust that our products are pure and effective for every level of athletics.
PROTEIN METABOLISM*: L-Arginine supports protein metabolism and is heavily involved in muscle metabolism through its role in the maintenance of a proper nitrogen balance.*
NITRIC OXIDE PRECURSOR*: L-Arginine is an important precursor of nitric oxide (NO) and thus plays a role in the dilation of blood vessels.*
GMP Quality Assured: NPA A-rated GMP certification means that every aspect of the NOW manufacturing process has been examined, including our laboratory/testing methods (for stability, potency, and product formulation).
Packaged in the USA by a family owned and operated company since 1968.
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