Light Magnesium Oxide BP can be used for a variety of purposes. This oxide can also be used as a laxative for quick, short-term stool emptying. Yes, using magnesium oxide on a regular basis is generally safe. However, before using any supplement on a long-term basis, see your doctor. Our product is essential for the proper functioning of hundreds of physiological systems, including blood pressure, blood sugar, muscle and neuron function. Some individuals use it as an antacid to treat heartburn, indigestion, or sour stomach.