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- Jan 10, 2019 -

Magnesium is a naturally occurring mineral that is important for many systems in the body, including energy metabolism, DNA production and bone structure. When magnesium is coupled with other elements, a wide variety of uses results. For example, magnesium oxide (CAS 1309-48-4) and magnesium citrate (CAS 7779-25-1; 3344-18-1 (anhydrous)) are two compounds frequently used in human consumption.

Though both compounds are used as dietary supplements and osmotic laxatives, magnesium oxide is poorly absorbed by the body. Around 4% of its elemental magnesium is absorbed, equivalent to about 9.5 mg out of a 400 mg tablet (with 60% elemental magnesium). On the other hand, magnesium citrate is much better absorbed by the body than magnesium oxide. It appears to have a bioavailability of 25-30%, meaning that between 25 and 30% of the compound reaches the systemic circulation. For this reason, magnesium citrate is the most common type of magnesium supplement and is the recommended choice for most issues and deficiencies.

In addition to dietary supplements and laxatives, magnesium oxide is also used as a heat-resistant material. For example, magnesium oxide wallboards are very appealing in construction due to their ability to withstand fire, termites, moisture, mold and mildew. Another niche use of magnesium oxide is as an antacid to relieve heartburn, a sour stomach or indigestion.

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