I haven't heard of those, so sorry, no, I don't know if they work. I don't know if you're looking to lose serious weight or just a few pounds, but I did the HCG diet and it worked WONDERS for me. It's great because it shapes and tones your body, and if you're going to lose serious weight, you're not left with the extra skin. It takes a lot of discipline but works. I would check it out and see if it's a diet for you.