I just knew it was less toxic than advil and that it was a partial agonist against a serotonin receptor.
EDIT: posted between when I opened the page and hit enter. The toxicity is very low, do you call caffeine a toxin? Anything can be toxic in high enough amounts.
And I posted a link and copied and pastied because I don't know the exact serotonin receptor it blocks. Saying it attacks the body isn't correct, yeah it's not exactly an apple but it being a partial agonist to a serotonin causes the effects.