There's 200 mg of caffeic acid in a cup of coffee, the green coffee extract capsules I bought from Life Extension have 400 mg in a capsule with only 12 mg of caffeine so I imagine decaf should still have enough. A couple of cups a day should do you.
I found a nice journal article from 2002 showing that nicotinamide is a potent inhibitor of proinflammatory cytokines.
