Epsom Salts, also known as magnesium sulfate, is a naturally occurring mineral compound that has been used for centuries as a remedy for a variety of ailments. It is most commonly used as a laxative and to treat muscle soreness, but it can also be used to treat skin conditions, reduce inflammation, and improve circulation. The term 'Limeys' is a slang term for British sailors, who were known to carry Epsom Salts on their ships to help with seasickness and other ailments.