Leptin, on the other hand, comes from the Greek term "leptos" which means thin. It is also a hormone, but its purpose is to regulate the flow of Keto Power Slim energy inside and out. This also includes appetite reduction and metabolism boost. So what do ghrelin and leptin weight loss hormones do? The truth is that these weight-related hormones were combined into a single diet pill called the Ghreleptin diet pill. Studies show that this is the first diet pill that uses this type of concept, which is again.