No, niacin will not help to clean THC or marijuana out of your system. Thanks for using AnswerParty!
A drug test is a technical analysis of a biological specimen – for example urine, hair, blood, breath air, sweat, or oral fluid / saliva – to determine the presence or absence of specified parent drugs or their metabolites. Major uses of drug testing are to detect the presence of performance enhancing steroids in sport or for drugs prohibited by laws, such as cannabis, cocaine and heroin.
A "10-panel urine screen" consists of 10 of the following: Environment