Niacin DOES work. Infact i smoked THE day of my last piss test. If you have notice...take two 500mg quick release(time capsules dont work because they dont give the full does effectively) 4 hours before the test. Then like an hour or two before your test take two more 500mg's. The first time you take the pills you will burn up, go crazy itching like you need a coke fix, and you might even get sick. But thats why you take it 4 hours before the test. Because when you take it again an hour or two before the test...all the effects have happened already with the last dosage so you get no noticable effects. Sometimes if you look like youve taken niacin theyll make you reschedule. Hope ive shown light on the subject...but im very stoned so i dunno what i just typed.:stoned: