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Magnesium sulfate

Magnesium sulfate (commonly called Epsom salt in hydrated form) is a chemical compound with formula MgSO4.

Epsom salt was originally prepared by boiling down mineral waters at Epsom, England and afterwards prepared from sea water. In more recent times, these salts are obtained from certain minerals such as siliceous hydrate of magnesia. It is used as a therapeutic bath, taken orally as a laxative, and to treat heartburn or constipation, and injected to prevent seizures.