okay niacin is a supplinment that helps you burn that stuff with exercises. i have always used pure creatine. i take 10-15 capsules 6 hours before my test. The way the creatine works is that it pulls water from all over your body and pushes it to your muscles. so what does your body do with excess water in your blood you piss it out. i only take it with one glass of water. and i will only let my self piss once before the test. Then an hour before i go tak it i chugg a 32 oz pop for color. so really creatine is masking using your own bodies water, but where the creatine comes in handy is that if you drink straight water and pass and then they test you bodies natural creatin level it will show up low and they will fail you for masking but if you take all of that creatine, it masks using water and your creatine level will show up normal or high. yes labs test you creatin level it how they make sure people dont chugg a ton of water to pass there test. i have been doing this method for 10 years and only failed twice. due to the fact i miss timed my drugs test and by the time i took it the creatin was out of my system, if you look at the back of most drinks from head shops the main ingredients are Niacin, Creatine, and Viatimen B12. These do not flush your body, you cant not flush your body without exercise. This is just masking. And i have a very fast metabolism and a few of my friends who have done the same thing also have fast metabolisms, so i bet that is a factor