My wife and I tried Dermatherm about a year ago. PP says it only works on a calorie deficit diet, then again all weight loss products work on a calorie deficit diet. My wife used it on a calorie deficit diet and I used it on a maintenance diet. Neither of use found it to be particularly effective. My wife lost about 7-8 over the course of a month about the same as she would have lost without Dermatherm. I lost nothing nor did I see any improvement in hardness. Don't get me wrong I’m normally a big PP fan I just don't think that Dermatherm is particularly effective product.