Kola Nuts

The kola nut, also known as cola acuminate, is a caffeine-rich nut that is native to tropical africa. In these regions, the nut is considered a symbol of hospitality and kindness. Though nearly tasteless on their own, kola nuts are often chewed before meals to help promote digestion and to help counteract possible ill effects from tainted drinking water.
Kola nut is a stimulant in its own right, containing 1.5% - 2% caffeine, plus theobromine, which increases cerebral circulation. Theobromine is the compound that can be found in chocolate and is thought to contribute a sense of alertness and well-being.