Hello, I have a question: How much is too much magnesium? Currently, I'm taking the mega man multivitamin, a liquid magnesium supplement, and a malic acid supplement(it also has magnesium in it). I would say with all these supplements combined, I'm taking about 400mg of magnesium. Is that too much? What is the threshold limit for too much magnesium?? Thanks again, Nathan PS. Anyone know of any good webpages on this subject? thanks!