Replied By Azuresea (Singapore, , Singapore) on 05/30/2011
Magnesium does work. I found that out by accident when I took a cal-mag zinc supplement. Almost immediately, my cramps went away in a matter of hours. In fact, I suggest that one takes magnesium at least once a month as adequate amounts prevents body from absorbing other heavy metals like aluminium, lead, mercury etc.
http://www.mg12.info/articles/cramps.html
Replied By Kathryn4 (Maryland) on 04/05/2015
Sometimes it is necessary to take a low dose 50mg of magnesium every night for persistent muscle cramps. Too much can give diarrhea.