Interesting, I didn't know that. As to stimulation effect for regular users... I guess it might depend, but for me, I do notice when I drink too much coffee. A

Interesting, I didn't know that. As to stimulation effect for regular users... I guess it might depend, but for me, I do notice when I drink too much coffee. And I am a "regular user" - I'd say I drink around 4 espresso a day (which is not a problem, but if say I bump that up to 10, I definitely feel it)