柠檬酸苹果酸钙（Calcium Citrate Malate，CCM），是钙、柠檬酸和苹果酸按一定比例合成的具有空间立体结构的有机螯合物，机体对其钙元素具有高吸收利用性。柠檬酸-苹果酸钙复合盐具有较好的溶解性、高吸收利用性、风味好等优点，是一种理想的钙营养强化剂。柠檬酸苹果酸钙的钙吸收利用率比碳酸钙高37% ，动物试验也证明柠檬酸苹果酸钙生物活性要显著高于碳酸钙，机体对柠檬酸苹果酸钙中的钙元素的吸收利用率和存留率比碳酸钙更高。柠檬酸-苹果酸钙复合盐之所以具有高吸收利用性，据报道可能与柠檬酸-苹果酸钙复合盐的组成成分柠檬酸和苹果酸是体内三羧酸循环 （TCA 循环）的中间代谢产物有关，随着构成柠檬酸-苹果酸钙复合盐的柠檬酸和苹果酸组分在体内进入三羧酸循环参与代谢，而柠檬酸-苹果酸钙复合盐缓慢地释放钙离子，从而提高了柠檬酸-苹果酸钙复合盐的吸收利用性。

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Calcium Citrate Malate (CCM) is an organic chelate with spatial structure synthesized by calcium, citric acid and malic acid in a certain proportion, and the body has high absorption and utilization of calcium. Citric acid-calcium malate complex salt is an ideal calcium nutrient fortification agent with good solubility, high absorption and utilization, good flavor and so on. The absorption and utilization rate of calcium citrate malate was 37% higher than that of calcium carbonate. Animal tests also proved that the biological activity of calcium citrate malate was significantly higher than that of calcium carbonate, and the absorption, utilization and retention rate of calcium citrate malate were higher than that of calcium carbonate. It has been reported that the high absorption and utilization of citrate - calcium malate complex salt may be related to the fact that citrate and malic acid, the components of citrate - calcium malate complex salt, are intermediate metabolites of the tricarboxylic acid cycle (TCA cycle) in the body. As the citrate and malic acid components that constitute citrate - calcium malate complex salt enter the tricarboxylic acid cycle in the body and participate in metabolism, The citrate - calcium malate complex salt releases calcium ions slowly, which improves the absorption and utilization of citrate - calcium malate complex salt.