Magnesium sulfate is an inorganic salt (chemical compound) containing magnesium, sulfur and oxygen, commonly called Epsom salt, taking its name from a bitter saline spring in Epsom in Surrey, England.
Epsom salt has been traditionally used as a component of bath salts intended to soothe sore feet. Epsom salt can also be used as a beauty product. Athletes use it to soothe sore muscles, while gardeners use it to improve crops. It has a variety of other uses: for example, Epsom salt is also effective in the removal of splinters.