Nothing: Any form of caffeine is going to be bad for you right now, as once it hits your system to give you the caffeine buzz you are wanting, it also will increase the acid output of your stomach and irritate your ulcer. You have to go totally caffeine free until your ulcer totally heals up and your doctor tells you it's safe to consume some again, but even then, you will need to keep it light.
Answered 8/5/2015
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