If you can find NON-standardized guarana supplements, try those.

The only active compound in guarana that the US acknowledges is caffeine, so when they standardize it, they standardize the caffeine content. I don't know about Australian forms. But there must be other active molecules, because the boost I get from guarana is very different from caffeine.

Wide awake. Alert. None of that caffeine edge. And after five hours, I just come down and I can go to sleep (unlike caffeine, which even in beverage form will keep me up 14 hours from the last ingestion).