Guarana
Guarana, which is native to the Amazon, also contains large amounts of caffeine and is sometimes used in energy drinks.
According to WebMD, the supplement can be unsafe if consumed in large amounts, as it also stimulates the nervous system and heart.
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“Guarana also contains theophylline and theobromine, which are chemicals similar to caffeine,” according to WebMD.
The supplement is sometimes taken by mouth to try help beat obesity or enhance athletic and mental performance.
Source: Daily Express
