Since 1947 Double Strength Heart Healthy Purified to Eliminate Mercury & Other Contaminants Gluten, Wheat & Dairy Free Dietary SupplementOmega 3 700 provides a natural, highly concentrated source of the Omega 3 polyunsaturates EPA and DHA from cold-water fish. This formulation promotes cardiovascular, joint and immune system health. It is molecularly distilled to remove mercury and other harmful contaminants.