Natural Living Magnesium Chloride Brine From the Ancient Zechstein Seabed Super Concentrated Gel 1st Choice Optimal Health Discussion: Magnesium Gel is a highly concentrate gel of pure magnesium chloride mined deep from under the earth's surface from the Zechstein Sea in the Netherlands. Easy to apply because of its gel form with no unpleasant odor. Ideal for skin conditions and massage can be used daily.