GuaranaGuarana or Paullinia cupana is a herb native to the Amazon basin largely used by Brazilian tribes during rituals. The herb has high caffeine content, nearly twice as high as regular coffee.In addition to caffeine, guarana also has other central nervous system stimulants in theophylline and theobromine.

Since it’s approval as “generally recognized as safe” from the FDA, Guarana has gone mainstream in a variety of forms like diet sodas, energy shots, capsules, and even as inhalers. It is claimed to have the ability to reduce appetite and provide instant energy.