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Muscle Nerve & Heart Support420 mg Per CapsuleTrusted for 50 YearsDietary SupplementGreat Formula Twinlab Magnesium Caps are easier to swallow and are well tolerated by most highly allergic individuals.Twinlab® Magnesium Caps deliver the recommended 420 mg of magnesium in just one capsule a day. Magnesium is an essential mineral for calcium and potassium assimilation and serves as a cofactor for more than 600 biochemical reactions in your body. A healthy diet may not provide enough magnesium for optimal health so it’s beneficial to supplement your diet with magnesium.