EPSOM SALTS is a horse feed that contains 100 percent Pure Magnesium Sulphate Heptahydrate. It should be given to horse feed as a supplemental supply of magnesium when necessary to maintain proper muscular, neuron, and gut motility functioning. Magnesium is essential for many body processes, such as maintaining strong bones and teeth, helping muscles contract properly, and producing energy at night when it's needed most. Giving your horse magnesium supplements is a good idea because he will likely not eat any harmful plants or chemicals and therefore may not be getting enough of this essential mineral in his daily diet. Magnesium is used by cells throughout the body to control electrical signals within the brain and heart, so if there are problems with muscle contraction or relaxation, the muscles of the tongue may not work properly. Thus, giving your horse magnesium supplements may help prevent muscle twitching or spasms caused by other factors. Magnesium can also be absorbed by an animal through its skin and feet. So, if you own a horse and want to provide him with extra magnesium, you should wash his feet thoroughly and apply some cold water applied liberally to allow time for the minerals to absorb into the skin. Finally, you can give your horse magnesium in the form of magnesium oxide (magnesia). This form of magnesium is safe and easy to administer, but it must be administered carefully because too much can cause stomach upset.