Help w/ using Niacin to verbs system:?

Ok... so I have a bottle of niacin; ea. pill is 500mg...and I might enjoy a drug screen tomorrow. Not sure if it would saliva or urine. So how do I nick this Niacin to clean my system? I've taken 2 pills so far...in the order of an hour ago...Help w/ using Niacin to verbs system:?
Don't take anymore. Mega doses of supplements are not undisruptive. You could end up harm yourself.
Seriously you would be better off heading to your local go before shop and buying "The liquid Stuff." Niacin isn't an significant cleanser, and you'll end up taking close to thirty or forty pills only for you skin to go red, burn and sweat excessively. I know for a fact that you still will not go past your urine test. And I've merely seen them do a saliva testing for very prominent, high profile job. More than likely, you are singular going to be piss tested.