What is Magnesium (Mg) �Oil�? Scientists have long known that magnesium is a critical player in cell metabolism, helping to transport other minerals across cell membranes and affecting cell mechanisms that control the activity of muscle and nerve cells. It is just not present in our food in the amount necessary for optimum function. Mg�Oil� is derived from pure ocean water. Tho it feels oily on application it not an oil! It contains a high percentage (2,492 mg/tsp) of Magnesium and about 80 other trace elements The oil is also Energeticaly activated.