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L-Citrulline Powder 200 Grams by Metabolic Maintenance is an amino acid that plays an important role in nitric oxide metabolism and regulation. L-citrulline raises plasma levels of L-arginine and nitric oxide over twice as effectively as L-arginine itself, without the gastrointestinal side-effects. Increased production of nitric oxide promotes vascular dilation and improved blood circulation. L-citrulline may also reduce muscle fatigue through ammonia elimination.