genetics is used by pharmedico for more of a sales tool than useful info. i dont believe any of them.
the answer may be in the minerals themselves.
iron is #26 on the periodic table. iodine, the heaviest element that is bioactive in the body, is #53. two times 26 is 52. so hydrogen is at the beginning and Iodine at the end with iron smack in the middle. there may be something to that.