My experience with cramps and muscle pain, even prior to Miracle-Mineral-Supplement , has been alleviated with added magnesium. Not all forms, of magnesium, are utilized by the body very well. You would need to experiment. Try magnesium citrate. It is very inexpensive to at least try it.
Do a GOOGLE on magnesium and muscle. You'll see how important it is. Also for the heart.