I am an "old"RN and researched magnesium a couple of years ago. Magnesium Chloride is the best and comes in oral tablets but is hard to find and nasty to swallow if it stays on your tongue! I use a spray that is easy to make from Magnesium Chloride flakes that i order from Swanson. Most of us are deficient in Magnesium. Google Magnesium deficiency. It will be an interesting read. Hope this helps.