Pure iron might not be toxic in the most literal sense of the word, still i would really recommend against eating it as long as it's not chemically bound to other elements. I don't think your stomach can bear it. It's still very sharp, not to mention hard. The link you gave me makes me in doubt... I've seen many conspiracy theory pages set up like that, so I need to see if I can verify that page. And pure iron may not be toxic (I need to look that one up, though), but pure sodium is... and let me tell you that when your body is entirely free of sodium, you'll die. Sodium is the content of salt that puts you on fire, due to it being highly reacting with water, and other element was chlorine, which is very lethal), and did you know one of the main elements in human hair is sulphur? Also not something I recommend you to eat in it's purest form. Bromide, all our food is full of it, but if you drink pure bromide, you'll die. And when it comes to mercury, I've been looking up on other sources, and I found a list of more medical practices in which Mercury is used. This source confirmed that most (not all, but most) mercury bindings are indeed toxic, but in medical terms that says little. Antibiotic (used to cure bacteria infections) is also toxic, and if it wasn't it wouldn't even work, as poisoning bacteria is it's primary function. A lot of medication is made out of toxic substances and wouldn't even work if those ingredients weren't used. Sounds pretty odd, doesn't it?