There are two phrases that should compel you to immediately grab an item and throw it in the garbage. If you see them in the store, turn away; warn other people that they are a waste of time.
The two magic phrases: “detox” and “fat burner”. There are others, as well; “cleanse” comes to mind when it’s on a box of something you consume, rather than scrub dirty things with.
I just had to deliver this warning after reading this story about a man who lost his liver due to a reaction with an herbal weight loss supplement. That is a rare reaction, so I don’t consider that cause to reject a medication; well-tested, useful medications also have a degree of risk. A good reason to be suspicious of such “supplements” is that they are not well-tested or useful — “fat burner” or “fat blaster” is meaningless noise suitable for snake oil salesmen like Dr Oz, and “detox” or “cleanse” products don’t actually do either. That’s not how biology works!
Just on general principles, run away from things with lying advertisements splattered all over them. All you’re getting is the risk and none of the benefit.