I take two Mag64s a day, and it's cut back on my twitching tremendously. Mag64 is the generic version of SlowMag which is rather pricey. I just get the five-pack.

http://www.amazon.com/s/ref=nb_sb_no...keywords=mag64

I ran into a problem with muscle cramping when I stopped dairy for awhile. I'm now taking vitamin D and making sure I get enough calcium from food or supplementing on an off day. The Mag64 also supplies 224mg of Ca in two tablets.