Pure Encapsulations Magnesium (citrate/malate) activates the enzymes necessary for a number of physiological functions, including neuromuscular contractions, cardiac function, and the regulation of the acid-alkaline balance in the body. It is necessary for the metabolism of carbohydrates, amino acids and fats; also for energy production, and the utilization of calcium, phosphorus, sodium, and potassium. This vital mineral also helps utilize B-complex vitamins, vitamin C, and vitamin E.