Oxaloacetic acid , is a four-carbon dicarboxylic acid appearing as an intermediate of the citric acid cycle. It is formed by the oxidation of malic acid in the Krebs Cycle , and it is an intermediate in the synthesis of amino acids and the metabolism of carbohydrates . Oxaloacetic Acid takes part in the gluconeogenesis, urea cycle, glyoxylate cycle, amino acid synthesis, fatty acid synthesis and citric acid cycle. Oxaloacetic Acid functions : - Increase lifespan - Regulate blood sugar levels - Protect pancreatic, neural and retinal tissues - Anti-fatigue - Boost antioxidant status ; - Calorie restriction - Fat loss