It only gives you bad gas if you use the cheap stuff. The cheaper the product the cheaper the filler they use. That whole tablespoon/scoop you put in that glass of water is not 100% creatine, more like only 5% actual creatine and the rest is just a filler. Call eas or sportpharm and ask them about fillers and stuff, they'll be glad to explain it to you cause they don't use cheap nasty fillers. Also about the gaining weight thing, it can be impossible some times I would take two of those calorie shakes a day (2500 each I think) and also eat 1 large pizza and other things and never gain a pound all through High School. As soon as I hit my early 20's I was eating the same and suddenly realizing "damn I'm getting fat" so I had to slow down my eating.