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Stimulants

Stimulant drugs are drugs that increase alertness and awareness. They increase the activity of the central nervous system, the sympathetic nervous system, or both. Stimulants are often used to boost endurance and productivity as well as to suppress appetite.

This category contains straight stimulants, such as caffeine and energy drinks. However, the Nitric Oxide and Fat Burners with Stimulants categories also contain a great deal of products with caffeine and other stimulants.

• Caffeine

  Caffeine is a bitter white crystalline that is a stimulant drug and a mild diuretic. It is completely absorbed within 45 minutes and typically has a half-life of 3-4 hours in the body.
  
  This article at MuscularDevelopment.com links to many studies touting caffeine as an excellent fat burner. Many bodybuilders swear by using caffeine in their pre-workout drinks (often times in Nitric Oxide drinks) for more focus, intensity, and accelerated fat loss.

• Energy Drinks

  Energy drinks are soft drinks that contain more stimulants than other soft drinks. They almost all include high amounts of caffeine, and typically have guarana, taurine, ginseng, B vitamins, and other chemicals that often intensify caffeine's effects. Use caution when consuming energy drinks with alcohol and limit yourself to two or less energy drinks.

• Guarana

  Guarana is a shrub with seeds are rich in caffeine. Guarana's fat-loss properties come from the fact that it contains caffeine, often noted in a percentage of caffeine content by products on this site. There is no difference between the caffeine in guarana and the caffeine in a drink such as coffee.