Two Dr. Eades recs on magnesium:

http://www.proteinpower.com/drmike/...low-carb-pt-ii/

2005 article, with types and dose also in the comment:

http://www.proteinpower.com/drmike/...d-inflammation/

The different types of mag, doses, brands, foods you are eating, tolerance build-up etc, etc, are all so different for magnesium you just have to find what works for you. I am taking Mag. Citrate 600mg but I will add or subtract 200mg depending if the bathroom effect is needed or not.