Uncle Lee's Body Slim series of Dieter Tea are blended with premium natural herbs and spices. The formula and preparation are based on an old Chinese book of medicine--"Detailed Outlines of Chinese Herbs", by Lee Se-Zhen, 1518-1593. After centuries of use, this formula has been proven to be one of the best healthy beverages for dieters. Besides from being caffeine free, we have added a bit of cranberry to the flavor for fruit lovers that enjoy a tangy taste in a cup of tea while benefiting from the effects of Uncle Lee's Body Slim Dieter Tea series. As our customers testify, these teas do not cause cramping. As with all natural laxatives, you should combine the taking these teas with the healthy addition of fresh fruits and vegetables and natural forms of fiber for good health.