There are a great many diet products out there, so it's always recommended that you search for information and product reviews since that information can be helpful. I recommend searching for the product name and the word review. As an example searching using the term, xenadrine review is a great way to find reviews on that product. Make sure you compare the ingredients as well as the price. I also always recommend reading the fine print as to any guarantee on a product, shipping and handling is rarely refunded, so how much the handling charge is, is an important fact to know.