Green Tea Extract- By increasing the body's metabolism, it is widely believed that green tea extract largely aids in weight loss.

Guarana is a climbing plant of the Sapindaceae family native to the Amazon basin. Guarana is best known for its fruit and seeds. Guarana extracts contain naturally high amounts of caffeine which the plant uses in defense against pathogens. Its extracts are a natural and abundant source of caffeine in most parts of the world. It is added to soft drinks, herbal tea, energy shots and used in capsules. The extracts have a positive effect on cognition and they also increase memory retention and physical endurance. A 2007 study on human pilots showed its positive effects on memory, alertness and mood. It is also reported to have antioxidant and antibacterial effects.