The present invention provides a method of administering magnesium threonate to a subject in need of supplementing magnesium. At least a portion of magnesium (Mg) and threonate (T) is present in a salt form of MgT2. The method may comprise administration of magnesium threonate at two different time points per day. The method may comprise administering, at a first time point, a first oral dosage form comprising magnesium threonate. The method may comprise administering, at a second time point, a combination of the first oral dosage form and a second oral dosage form comprising magnesium threonate. The first and second oral dosage forms may exhibit different dissolution profiles in a dissolution medium.