From a pure and natural source The magnesium oil contains high-quality magnesium from deposits of the former Zechnstein Sea. This sea, which dried up approximately 250 million years ago, is considered a particularly pure and natural source of magnesium chloride. Due to its high saturation level, magnesium chloride feels oily, although it is not actually an oil. It can be used as a supplement on the skin to help with magnesium deficiency. Application: Spray onto the skin daily as needed, e.g., on muscles, joints, legs, arms, back, or shoulders, and massage in. Leave on for at least 30 minutes and then shower off. It can also be used as a (foot) bath additive.