i have passed 10+ drug testing and would smoke up until the day before the test and would drink about a gallon of water with the niacin pills about 20-50 pills the pills help your body sweat it out and make u uruinate out the toxins it is considered a wieght loss pill helps remove toxins now energy drinks have sugars and caffeine that will help keep thc in your fat cells an u will show more in your piss test an since i useed htis method 10+ times i showed others the exact method resulting in one time that the niacin didnt work but in 15 or so other times it has