By Dan Antony Updated Mar 24, 2022
Magnesium carbonate (MgCO₃) is a naturally occurring white solid found as magnesite. Often hydrated, it is widely used in industry and everyday life.
Medical professionals recommend magnesium carbonate as an oral supplement for patients with hypomagnesemia—common in individuals on diuretics or experiencing fluid loss from diarrhea or vomiting.
Pure magnesium carbonate serves as an effective antacid, neutralizing stomach acid. When used in high doses it also provides a mild laxative effect. Antacid formulations frequently pair it with aluminum hydroxide to counteract constipation.
Athletes such as gymnasts, climbers, and weightlifters rely on magnesium carbonate chalk to absorb sweat and improve grip. Unlike traditional blackboard chalk, which contains calcium carbonate, magnesium carbonate offers superior moisture absorption.
Its excellent thermal insulating properties, coupled with being non‑toxic, lightweight, and non‑flammable, make magnesium carbonate ideal for heavy‑duty insulation in shipbuilding, boiler manufacturing, and appliances like ovens and dishwashers.
Because of its hygroscopic nature, food‑grade magnesium carbonate is added to salt and flour as an anti‑clumping agent, keeping products dry and free of moisture damage.
