9 doctors weighed in:

Will niacin flush free clean out my system for thc?

9 doctors weighed in
7 doctors agree

In brief: NO

Only time will help clear thc.
It can take uo to 1 month for thc to clear.

In brief: NO

Only time will help clear thc.
It can take uo to 1 month for thc to clear.
Dr. Caroline Cribari
Dr. Caroline Cribari
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Dr. Ed Friedlander
Pathology
2 doctors agree

In brief: No

It will not remove thc, the metabolite of cannabis, prior to a drug test.
It is not a good idea in any case. Niacin makes your face flush / turn red, and someone imagined that this might "flush" toxins from your system. This isn't the place to debate the wisdom of testing for cannabis; if you test with a low level, you might claim it was second-hand smoke. I'm sorry this is happening.

In brief: No

It will not remove thc, the metabolite of cannabis, prior to a drug test.
It is not a good idea in any case. Niacin makes your face flush / turn red, and someone imagined that this might "flush" toxins from your system. This isn't the place to debate the wisdom of testing for cannabis; if you test with a low level, you might claim it was second-hand smoke. I'm sorry this is happening.
Dr. Ed Friedlander
Dr. Ed Friedlander
Thank
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