Detox Foot Pads?

So those detox foot pads that you always see advertised on late night TV that suck the toxins out of our body - do they work? I always see them and and it is interesting that they become black after you leave them on your feet for a few hours. Where does all that stuff come from? THe veins, the skin? It just bothers me that they are advertised on late night because that makes me think they are something like those weight loss pills and not good for you. However, I do want to get some of these foot pads and see if there is much bad stuff in me as they show on the box.
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