Natural Living 1st – First Choice Optimal Health Discussion: Magnesium Oil w/D3 is a highly concentrated spray of pure magnesium chloride minded deep under the earths surface from the Zechstein Seabed in the Netherlands with added Vitamin D3 (as Cholecalciferol). It's the perfect combination--the way nature intended. It is non-greasy, easy to apply, and can be used daily. No animals were used to test this product.