Guarana contains more caffeine than coffee, but both substances have health benefits. Consuming too much caffeine from any source can cause unwanted side effects.
Guarana and coffee contain different plant chemicals but share caffeine in common. Caffeine is a stimulant, and having too much of it can cause side effects such as anxiety and palpitations.
This article discusses whether the effects of consuming caffeine are different depending on whether it comes from guarana or coffee.
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