Clinical Strength 100% Natural Magnesium Chloride Solution From the Ancient Zechstein Sea Optimal Health No Animals Were Used to Test This Product Discussion: Magnesium Topical Spray contains a 100% natural solution of magnesium chloride. It is extremely pure, mined deep under the earth's surface from the pristine Zechstein seabed in the Netherlands. It can be used daily, is non-greasy, and has no odor.