I've been eating right and exercising for awhile now (maybe 10 yrs or so), but noticing that once I hit my 40s, I had to exercise more, and more strenuously, and eat even less to stay at the weight I wanted. I realize metabolisms will naturally slow as we age, but I was still bummed because I hate exercising (so I didn't want to have to do so much more), and I had already reduced my calories after 40. I started hearing about Raspberry Ketones and decided to try them. It took me awhile to find one that was pure (only had the raspberry)-- I didn't want to take a caffeine supplement since I have an adverse reaction to caffeine. I've been using these for a few months now and am loving them. I absolutely notice in a difference, in that I can go back to moderate exercising (4x's per week) and healthy eating, but not all salads and diet food. I think the people who left the low reviews were expecting a quick fix, or something that let them eat whatever and not exercise and that the pounds would magically melt away. As far as I know, there's nothing like that that also doesn't harm the body. This supplement is easy on my stomach (I still take it after meals, to be sure)--I have no side effects with it (it's just raspberry), and I am pleased with the results (after I stuck with it for a few months). If I took a pill that just "magically" changed my body or allowed me to give up exercise or eating right, I might love it at first, but before too long I'd worry about how it achieved that and what it was doing to my health in the long run. With these ketones, I feel confident in taking them long term, as an addition to my healthy diet (relatively healthy--I still splurge on weekends!) and my moderate exercise routine. I credit this product with helping me live a more balanced life, and I find I'm thinking about/worrying about my weight/metabolism less often, which is a gift!