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Cardiovascular Health and EnergyNitric Oxide EnhancerDietary SupplementTotal Wellness for Mind Body & HomeUnsurpassed Purity & PotencyScience-Backed Quality Since 1969Move over creatine! Swanson® L-Citrulline Malate Complex is the energizing combination that kicks in beyond the Krebs cycle. It's bursting onto the nutrition scene in a big way helping people young and old break through the boundaries of physical health energy and performance. L-Citrulline Malate is active in both the Krebs cycle and the urea cycle of metabolism which means it promotes energy production while simultaneously helping to rid the body of fatigue-causing metabolic waste products.L-Citrulline is a unique amino acid first isolated from watermelon and produced in the body from the amino acids ornithine and arginine. It's a key player in the urea cycle which is the process responsible for eliminating the metabolic by-products of protein metabolism. These by-products primarily ammonia and lactic acid contribute to muscle fatigue. By helping to efficiently remove them L-citrulline helps fend off fatigue for greater comfort and endurance. L-citrulline also acts as a precursor to nitric oxide a compound that helps relax blood vessels to promote healthy circulation and ensure a steady supply of oxygen and nutrients throughout the body.Malic acid is an organic compound made by all living organisms. It performs a vital function in cellular energy production as an intermediary in the Krebs cycle (also known as the citric-acid cycle) the metabolic pathway that produces ATP (adenosine triphosphate) the primary energy source for every cell in the body.The dual-action effects on energy production and waste elimination make our L-Citrulline Malate Complex the perfect nutritional boost for physical comfort and endurance.