TRACE MINERALS MEGA-MAG 400MG is supplement that helps to support blood pressure hypertension, heart health, calm mood digestion, muscle cramps, spasms and better sleep. Ingredients: A High Magnesium, Low Sodium Concentrate From Utah's Inland Sea, The Great Salt Lake. Directions : 1/4 to 3/4 teaspoon daily, to top off or fully supplement your diet with magnesium. As this is highly concentrated product, we recommend starting with 1/4 teaspoon and increasing as needed, ideally spread throughout the day.