The link between diabetes mellitus and magnesium deficiency is well known. A growing body of evidence suggests that magnesium plays a pivotal role in reducing cardiovascular risks and may be involved in the pathogenesis of diabetes itself. While the benefits of oral magnesium supplementation on glycemic control have yet to be demonstrated in patients, magnesium supplementation has been shown to improve insulin sensitivity. Effects of Magnesium (Mg) supplementation on the glycemic control of 63 mild gestational diabetic patients were investigated. The use of an ionic, liquid minerals containing concentrated amounts of magnesium and chloride (CMD) was used for supplementation during the two week period and showed good glycemic control in the study group without additional need foe insulin injections.