According to Mercola article: http://www.mercola.com/2004/aug/7/miracle_magnesium.htm
Current research on the paleolithic or caveman diet shows that the ratio of calcium to magnesium in the diet that our bodies evolved to eat is 1-to-1. 18 In order to offset the deficiency magnesium induced by excess calcium and to treat the above 22 conditions, people may find it necessary to ingest one part magnesium to one part calcium in supplement form for a period of months to a year. Stabilization on a healthy diet including green drinks may be possible after that time. The most commons sources of magnesium are oxide, citrate, glycinate, and malate. People use oxide and citrate if they suffer from constipation to take advantage of magnesium's laxative effect. Glycinate seems to cause little diarrhea and is the best choice for people who already have loose stools. Magnesium malate has been promoted for people with fibromyalgia to help break up lactic acid that seems to be part of the fibromyalgia picture.
