I apologize for getting it wrong in my previous post. I was correct in saying that magnesium oxide is not a good form of magnesium to take as a supplement. One of the better forms of magnesium to take is
chelated magnesium. I get mine from Vitacost (which currently has it on special buy one, get one half off):
http://www.vitacost.com/vitacost-che...-180-tablets-3
And here is a link that does a better job of explaining which magnesium supplements are good and which are not:
http://www.medhelp.org/posts/Heart-R...y/show/1002415