Nivea My Silhouette and Nivea Goodbye Cellulite: Do they really work?

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I've been thinking about trying these for a while. Since I've lost weight, I am left with loose skin and stretch marks, and of course the ever present cellulite. I've seen these tried out at the Tyra Show, but I was disinterested then, and I am not sure of the results. I've also checked out opinions online, and of course, I found good and bad. I was more interested in Goodbye Cellulite and was planning to try it out. I brought it up with a friend who tried it (but didn't work) and she told me that it's not real and that the stuff does not really make your cellulite go away. Indeed it only promises to "reduce the appearance", but the scary thing she said was that the stuff contains substances that intentionally irritates the skin to get it to have a tighter look. This is probably why some get allergic reactions and that the cellulite comes back when you stop using it. What is your take on this? And do you think the Nivea Tightening Lotion is the same?