Magnesium is an essential mineral that's available to the body in numerous forms. When consumed, it helps sustain many of the body's most important processes. Magnesium also supports the heart, brain, nerves and muscles. Kal's Magnesium 500 mg Once Daily is formulated with a combination of the most important forms of magnesium for your health. An added amino acid complex enhances benefits, while the exclusive ActiSorb Base promotes improved mineral absorption.