Trader Joe's used to sell Guarana extract tablets at $2.99 for a 60 count or so. They don't carry it anymore.

Guarana is good stuff, one needs to keep in mind, it accumulates when taken every day, faster than it breaks down and is expelled.

I used those on a road trip from CA to FL.
When I arrived in Miami I stopped taking them, still I couldn't sleep for almost 48 hours.
After that I collapsed ...

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