Magnesium is a mineral that's important to the health of the brain, heart, and skeletal muscles. Magnesium glycinate is the magnesium salt of glycine, an amino acid, and is the most bioavailable form of Magnesium, which means it is the most absorbable in the body. In addition, a high quality Magnesium glycinate can help support stress management, a sense of calming and in high doses support motility.