Niacin is one of the oldest scams, to beat the urine tests (it worked with the 'old' tests, won't help you, with the newer ones - it 'mimicked' a missing enzyme, that was an indicator of THC being present) ... it's also so well-known, that every legitimate test, looks for 'indicators', niacin being one of the first ... bleach is also an old-time 'fix' ... nowadays, they aint gonna save your ass :smokin: