Guarana is an herbal supplement that is commonly used for weight loss or as an energy supplement. Its active ingredient is caffeine, which works as a nervous system stimulant and diuretic. At this time, no research studies have been conducted on the effectiveness of guarana for weight loss. Although low doses are probably safe, high doses could potentially cause problems.

What Is Guarana?

Guarana is a plant that grows in the Amazon. It is best known for its berries, which are used as an herbal supplement, usually marketed as a weight loss product or energy supplement. It is commonly used in soft drinks and energy beverages.
(Click Guarana Uses for more information.)

How Does It Work?

Many people are not aware that the active component of guarana is actually caffeine. The berries of the plant have a high caffeine content (even more than coffee beans). Caffeine works as a nervous system stimulant and as a diuretic (a "water pill").

Is Guarana Effective?

There is a lack of scientific evidence to support a conclusion that the supplement is effective for weight loss. No adequate research studies have been performed and published using this substance for weight loss.
(Click Does Guarana Work? for more information or How to Lose Weight to find helpful suggestions for losing weight.)

Dosing Information

Currently, there is no established safe and effective guarana dose. More research is necessary to determine an appropriate dose.
(Click Guarana Dosage for more information.)
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