Magnesium L-threonate is the most easily absorbed artificial magnesium on the market today. Magnesium is a common mineral found in a variety of foods. It is very important for human health. Magnesium L-threonate is a food nutrient fortifier made through synthetic reactions such as vitamin C, calcium carbonate, and magnesium carbonate. Magnesium L-threonate is a mineral that benefits the brain. Magnesium L-threonate can pass through the cell membrane of brain cells and increase the concentration of magnesium in the brain.