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Cardiovascular Health and EnergyPharmaceutical GradeDietary SupplementPromotes Nitric Oxide ProductionMaintains Healthy Blood CirculationPromotes Energy ProductionScience-Backed Quality Since 1969Kyowa QualityMaximize your energy with Swanson Ultra Pharmaceutical Grade L-Citrulline. As a key player in the urea cycle L-citrulline boosts cellular energy production while aiding the elimination of metabolic by-products that can cause fatigue. It also acts as a precursor to nitric oxide supporting healthy circulation to muscle tissues. Our veggie caps feature Kyowa Quality™ pharmaceutical grade L- citrulline produced through a proprietary fermentation process that ensures consistent purity and potency.