✔ WHY NUTRAVITA’S MAGNESIUM ESSENTIALS?. – Our high dosage formula contains 500mg Magnesium per daily serving (1 tablet). ✔ HOW DOES MAGNESIUM HELP ATHLETES, RUNNERS, AND DURING EXERCISE?. – The role of magnesium especially during strenuous physical activities of people who train or work out on a daily basis is essential as minerals including magnesium are lost when we sweat.