no i can't say that the niacin was necessary for the pass of a test but it was a 16oz. bottle..called 4:20 De-Tox by Dr. Greens... uh shit it doesn't even have niacin, i took a better look at the label of ingredients and it has: Vitamin A, C, E, B1, B2, B3, B6, B12, Calcium, Iron, Folic Acid, Biotin, and Pantothenic Acid.. and the instructions say to Drink whole bottle, then after 15 minutes, drink 16 oz. of water, urinate frequently, drink 16oz. of water per hour and avoid foods high in sugar, caffeine, alcohol, vitamins and goldenseal. no niacin though, guess my high mind imagined i saw it labeled