>In 1827, M. Oudry isolated "théine" from tea, but in 1838 it was proved by Mulder and by Carl Jobst that theine was actually the same as caffeine.
>guaranine (uncountable)
>Caffeine extracted from guarana.

>mateine (uncountable)
>(organic chemistry) Caffeine extracted from maté plant.
first of all, its all caffeine. second of all, where does overdosing on it even come into the picture when you're not consuming it