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It's been a couple of days since I started using the Coffee Tamer, and I can really say it's cut down on my burping. The only thing I really don't like is I can't drain my cup anymore. They say the stuff is tasteless, which is true until you hit the undissolved sludge at the bottom of the cup - it tastes like minerals. So, if you're going to use it (and I recommend it if you get gas or upset stomach from coffee), stop with a bit left & rinse your cup. Otherwise, thumbs up!