guaranine

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Related to guaranine: Guarana, Paullinia cupana

caf·feine

(kaf'ēn), Although this word was originally pronounced in three syllables, modern usage has fused the second and third syllables into one. Avoid the mispronunciation kaf-ēn'.

An alkaloid obtained from the dried leaves of Thea sinensis, tea, or the dried seeds of Coffea arabica, coffee; used as a central nervous system stimulant, diuretic, circulatory and respiratory stimulant.

Synonym(s): guaranine, thein

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* Guarana is "herbal caffeine" from the guarana plant, which contains guaranine, a stimulant similar to caffeine.

Tired? Worn-out? How to get your energy level back up again

It contains extra glucose and guaranine - which has a similar effect to caffeine - and each bar has 320 calories.