Magnesium Sulphate Heptahydrate (also known as Epsom Salt) has a formula of MgSO4.7H2O. We provide pure white crystalline epsom salt with 98% purity and Mg content of above 9.5%. We produce agricultural (fertilizer) grade epsom salt.Magnesium Sulphate Heptahydrate provided by our company, is a naturally occurring mineral used to control low blood levels of magnesium. This is also used for paediatric acute nephritis and to prevent seizures in severe pre-eclampsia, eclampsia, or toxaemia of pregnancy. This also increases water in the intestines. Magnesium Sulphate Heptahydrate is a naturally occurring mineral that is important for many systems in the body especially the muscles and nerves. This is used as a laxative to relieve occasional constipation. This is available without a prescription.