Magnesium malate is often used to treat fibromyalgia. Magnesium oxide is commonly used therapeutically as a laxative and relief for acid reflux. Magnesium oxide contains the highest levels of magnesium, according to the Office of Dietary Supplements of the National Institutes of Health.
Magnesium malate is a compound of magnesium and malic acid. According to the National Institute of Health, magnesium malate is considered an alpha hydroxy acid, and among the fruit-derived acids that are good for the skin. Magnesium malate also promotes the production of saliva, which helps control oral bacteria. Because of its antiseptic properties, magnesium malate is used in toothpaste and mouthwash. This is a highly absorbable form of magnesium, and it can help with migraines and chronic fatigue syndrome, as well as fibromyalgia.
Magnesium Oxide is formed by the calcination of magnesium carbonate or magnesium hydroxide. Magnesium Oxide is also called Magnesia. While this type of magnesium shows high levels of concentration, it has poor levels of bioavailability, according to Global Healing Center. In addition to using it as a laxative and as relief for acid reflux, magnesium oxide can also help with muscle relaxation and energy production. Magnesium oxide is one of the less expensive forms of magnesium, so it is frequently used in poor quality supplements.