DL-malic acid (hydroxysuccinic) - derived mostly from fruit, as well as food additive for the adjustment of its acidity. It takes part in the so-called. Krebs cycle (formed with fumaric acid, oxidized to oxaloacetate form). It is a component of creatine malate and citrulline, creating a single molecule, increasing their action. This results in greater availability of creatine and citrulline. It improves the absorption of magnesium. It is part of ergogenic supplements.