Swanson ® Full Spectrum ® Guarana is a dietary supplement intended for adults. Each capsule of the preparation contains 500 mg of guarana seeds, which are a natural source of caffeine. What is guarana and how does it work? Guarana ( Paullinia cupana ), also called thorn or thorn, is a species of vine in the soap family. Under natural conditions, it occurs in the Amazon and Paris basins (Brazil). The common name guarana comes from the name of the bitter-sour drink made from its seeds and is associated with the Guarani tribe. Guarana seeds are highly prized for their health-promoting properties. Paullinia cupana is traditionally used to control proper body weight, as it helps maintain fat metabolism. The Swanson brand preparation uses seeds that contain 4-8% caffeine, which corresponds to 20-40 mg of caffeine in each capsule. Swanson ® Guarana 500 mg Full Spectrum ® is just 1 capsule per day to supplement the diet of women and men. A pack of 100 will last over three months of daily use.