Pure caffeine is quite different - it removes many of the (negative) effects, notably stomach upset, bloating, frequent urination. For me, powder in capsules w

Pure caffeine is quite different - it removes many of the (negative) effects, notably stomach upset, bloating, frequent urination. For me, powder in capsules works best, pressed tablets are slower to take effect, and the brand also matters, although there's so many of them you'd have to try and see for yourself - either part of the extraction process or the source of caffeine is different, but some brands are noticeably and consistently different in effects. Some have that brain fog and jitteriness that is common with coffee, some are just a clean alertness with clean withdrawal. Quitting coffee using pure caffeine might work for some, and not for others.