Sumatra Slim Belly Tonic has a strict 90-day, 100% money-back guarantee. If you haven’t lost weight with Sumatra Slim Belly Tonic in 90 days, or if you’re not satisfied with the results of the supplement for any reason, contact customer service to request a full refund. You can contact the manufacturers of Sumatra Slim Belly Tonic and the company’s customer service team.