yea 3 weeks is a good amount.. however i don't imo believe that niacin is all cracked up to be in regards to drugs testing... either way the best bet is to probably take 3 weeks if you want to lower your tolerance
Deepsuthern Reviewed by Deepsuthern on . Will this work? I am taking a 2-3 week break from marijuana, mainly to lower my tolerance. Will taking something that is supposed to help me pass drug tests, like niacin, lower my tolerance? Does it get the thc out of my system? Rating: 5