Chloe,

You'll hear from "mainstream" people that your calcium/magnesium ratio should be 2:1 in favor of calcium, BUT they got that number from only looking at the bone content and not taking into account that the muscles contain and need a lot. Ann Louise Gittleman (a nutritionist) was the one who put me onto the fact that it really should be 2:1 in favor of magnesium. And for mercury poisioned people (hg blocks mg and also causes you to need more to deotx all that hg), I personally have seen that you shouldn't take supplemental calcium at all because you most likely are getting enough calcium (unless you don't do dairy) and taking a calcium supplement will make a mg deficiency worse because it will take mg from your bones to try and process that .