One common myth about passing drug tests is that consuming goldenseal, which is an herb with a bitter flavor, can remove THC from the body. As the theory goes, you have to mix it with Niacin and the two combine to help solve this problem for you. The problem is this stuff can give you diarrhea and stomach aches, and it also has an extremely disgusting taste. You’re putting yourself through this even though the evidence it works is pretty much nonexistent. Niacin also has side effects, including giving you a “flushed” feeling. These methods are unpleasant and unlikely to work so you are better off avoiding them.