Magnesium taurate is supposed to be especially good for the heart.  There 
is also something called Jigsaw magnesium that NYC complementary/alternative 
physician Ronald Hoffman mentions on his radio show.  He does not sell this 
product -- he is simply a big believer in magnesium and as an athlete, he 
uses magnesium for muscle cramp prevention/alleviation. I've been using 
Natural Calm but am concerned about the lead content I read about on Consumer 
Lab's web site.  I may also try a transdermal version if I can find a reputable 
source -- that would surely bypass the laxative issues if I'm using it for 
muscle soreness etc.