I have just found this thread.

I worry about the very issue of how "much to take." With regard to my magnesium use, for example, my recent lab test was 2.0 mg/dl. But if I take less than 800-900 mgs. per day (600 in multi-vitamin as "Oxide & Glycinate," 200-300 as citrate), I start getting horrible foot and leg cramps. In addition, I am thinking of adding a completely new anti-oxident, resveratrol. It seems that opinions are divided on the effectiveness and safety of this. Like mrsD, I take ubiquinol, r-lipoic and krill oil, but I wonder about the safety of those, too.