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Guarana, an herb from the Amazon rain forest, has a long history of use as a stimulant beverage. It has also been used to treat arthritis, diarrhea, and headaches.
A typical dose of guarana supplies 50 mg of caffeine, about half the amount in a cup of strong coffee. However, a 1998 analysis of products on the market indicated that many guarana products contain less than the advertised amount of guarana. 1
- Carlson M, Thompson RD. Liquid chromatographic determination of methylxanthines and catechins in herbal preparations containing guaraná. J AOAC Int. 81(4):691-701.