It definitely varies wildly. Some methods of decaffeination might leave as much as one-third of the coffee still in the beans. I'm a regular coffee drinker (an

It definitely varies wildly. Some methods of decaffeination might leave as much as one-third of the coffee still in the beans. I'm a regular coffee drinker (and not caffeine sensitive), and I do get a placebo boost from decaf, but without any noticeable effects from actual caffeine.