Commonly known as Epsom salt, a magnesium salt used as a texture enhancer. https://www.paulaschoice.com/ingredient-dictionary/ingredient-magnesium-sulfate.html?q=Magnesium%20Sulfate&fdid=ingredients Epsom salt is also known as the chemical compound magnesium sulfate, and comes from the English town of Epsom, which is also named after. The salt was produced by boiling the mineral water in the town. Today, Epsom salt is known by many who use it diligently in everyday life for e.g. bath salts and for foot baths. https://www.med24.dk/epsom-salt-magnesium-mineral