Many of the products that promise miracle cures or instant solutions to weight loss and muscle building are sold through the mail and over the Internet. It is risky to purchase these products because there is no quality control or regulation of these products. To make you feel safe, these companies promise money-back guarantees, but it can be difficult to track down the companies after you have purchased the product. You may want to see if the company is registered with the Better Business Bureau. Companies registered with the BBB have to demonstrate ethical and sound business practices in order to gain membership.