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L-Arginine is now available in high strength 1000 mg pills that are non-GMO. Arginine is a conditionally necessary basic amino acid that plays a role in urea metabolism and excretion, as well as DNA synthesis and protein biosynthesis. It is a key precursor of nitric oxide (NO), which helps to dilate blood arteries. This product contains pharmaceutical-grade L-Arginine. This product may exhibit natural color variations.