Niacin was used to beat the Navy's drug tests (one of the first MJ tests developed), but that was 30 years ago, or more ... the test developers included a niacin scan in there long ago, so best ya keep looking, niacin ain't gonna do ya any good ... besides, the amounts that were necessary in those days, turned sailors' skin orange for awhile :wtf: ... same non-results using bleach in the samples, etc., (while looking for THC, the tests also look for assorted cloaking agents ... :smokin: