Highly Concentrated NOW Solutions Magnesium Topical Spray is a pure, highly concentrated, topical magnesium chloride solution sourced from the Ancient Zechstein Seabed in the Netherlands. This Magnesium Spray is easily applied and non-greasy. Approximately 4 sprays equal 66 mg of elemental magnesium. Ingredients: Water and Magnesium Chloride Hexahydrate Spray 2-5 times onto your skin and massage the area. Magnesium Topical Spray may feel slightly oily after application, but it is not an oil and will absorb quickly. You may see white residue form around the applied areas; this is just leftover salt that can be wiped off. For a foot soak add 1-2 oz. to warm water and soak feet for 20-30 minutes.