This premium magnesium L-threonate supplement is packed with health benefits. Magnesium is an essential mineral that plays a key role in your overall health. The form is chelated and gets highly absorbed. Each capsule contains 50 mg of elemental magnesium, with a once-daily adult serving of up to 200 mg. The 124-capsule bottle typically provides a 1 to 4-month supply, depending on your age.