Guarana is a plant that is native to some parts of the Amazon Rain Forest and has properties in the seeds that grow on the plant that are approximately double that of caffeine in coffee beans. It is this reason that it may not be a perfect aid for losing weight, as it can affect the central nervous system, and the heart. Anxiety can also be associated with guarana as well as a rapid heart rate.

This is an ingredient found in some energy drinks, and the seeds from the plant are also rich in tannis, theobromine, theophylline, and xanthine alkaloids.

The reason that it is believed to be a weight loss supplement is due to the caffeine content, and that it is a fat burning supplement because of it. There has also been some research that showed while it had no real effect on lipid metabolism; it did have effects on improved memory, alertness and mood.