[1] It is used as a mineral supplement, and as an ingredient in manufacturing of cosmetics and household products.

[2] Long-term deficiency of magnesium may result from chronic alcoholism or some prescription drugs.

[2] Signs of deficiency that may require magnesium supplementation include loss of appetite, nausea, vomiting, fatigue, and weakness.

[3] However, excessive magnesium supplementation causes diarrhea — a side effect used by prescription as a laxative.

[2][3] Individuals with kidney disease have higher risk for adverse effects with magnesium supplementation.