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Muscle and Bone HealthMineral SupplementEssential for Strong Muscles and Bones Cardiovascular Health and MoreHelps Promote Bowel Regularity and Supports Digestive HealthScience-Backed Quality Since 1969There are many types of magnesium all with distinct health benefits. Magnesium oxide has a lower absorption rate into the bloodstream compared to other forms which delivers more magnesium to the GI tract making it uniquely suited to supporting digestive regularity. Swanson Magnesium Oxide features a potent 500 mg per serving of this essential mineral.