Thanks for the info!
I take Source Natural's Mag Malate as well. I'll up it and try the glycinate and see what happens. I'll check out that book too.
CL- Personally I started taking Magnesium Malate specifically for fibromyalgia. It's thought that people with it both lack magnesium and could benefit from more malic acid (not a lot of food sources of it to my understanding...green apples, green grapes, and a smattering of other things). I did notice that many reviewers of it wound up taking A LOT of it before they noticed relief. I'm thinking that may be because it's still not the best form for absorption, though it's a little better than the forms you would find in a basic grocery store vitamin aisle.