Magnesium is a chemical element whose symbol is Mg. It is a mineral component that is classified as a macromineral because it is found in significant quantities in the human body, where it is stored mainly in bones and muscles, and only 1% of the element is found in the blood. It is a compound widely distributed in foods, found in both animal and plant products. Nutritional sources of magnesium include whole grain products, dried legume seeds, as well as nuts and green leafy vegetables. The OstroVit preparation uses magnesium bisglycinate, a magnesium chelate, that is, a compound that combines magnesium with two molecules of the protein amino acid, which is glycine. Magnesium bisglycinate is a substance distinguished by its high bioavailability and, in addition, does not contribute to the appearance of digestive system discomfort, which positively affects the quality of the product and the effectiveness of its supplementation. Among its many functions, magnesium helps reduce tiredness and fatigue and helps maintain electrolyte balance. In addition, it promotes the proper functioning of the nervous system and helps maintain proper energy metabolism. This mineral also promotes proper muscle function and helps maintain healthy bones and teeth. In addition, it intervenes in the process of cell division and promotes the maintenance of optimal psychological functions. Magnesium bisglycinate is magnesium bonded to two glycine amino acid molecules. Glycine alone can improve sleep and reduce anxiety, depression, and stress.