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A member asked:

Why might guarana be prohibited?

A doctor has provided 1 answer

News to me: This is generally recognized as being as safe as coffee. Politics drives what is banned and not banned in the usa; totally safe stuff like saccharin are illegal, while obviously dangerous plant products comfrey and graviola remain in the shelves. If a celebrity dies while taking a supplement (as happened with guarana) there's usually a foolish media circus.

Dr Hickerson agreed

Answered 9/9/2019

5.6k views

Thank

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How long do the effects of Guarana last? I took a guarana caffeine pill a week ago (never took caffeine pills in the past) and since then, my movements have been shaky/tremor. I have not seen research on how long tremor lasts from one use. Thank you?

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