Looking to support your diet or exercise programme? Guarana, a Brazilian herb, is used in energy drinks, pre-workout powders and nootropics, and also popular in people with body composition goals. Each of these handy capsules from Swanson Health is packed with 500mg of guarana. Looking to support your diet or exercise programme? Guarana, a Brazilian herb, is used in energy drinks, pre-workout powders and nootropics, and also popular in people with body composition goals. Each of these handy capsules from Swanson Health is packed with 500mg of guarana. 500mg of guarana per capsule. Popular Brazilian herb. 100 capsules per pack Guarana from Swanson Health provides 500 mg of Guarana per capsule. Guarana is a natural source of caffeine.