did you read the link I gave you, by Unyquity? Very little caffeine is absorbed, however, since the coffee sawilsons offers is bred to have more caffeine, I would venture to guess that the caffeine is important...
It's NOT the same as drinking it. CE's are a great adjunct protocol to any detox regimen.
And, the first time I did one, I used plain old organic coffee. I was bouncing off the walls, most unpleasant. The SAwilson's coffee is much better.
CE's are great, they leave you feeling clean & refreshed:)