Sure gel and certo are pretty much the same thing. This question gets asked and answered many times a week so the search feature would have helped you find the answers you need. Read my response in the following link.

http://boards.cannabis.com/drug-test...-evrytime.html
FakeBoobsRule Reviewed by FakeBoobsRule on . Sur Gel Passing MEthod Need some input I have a drug test coming up in about two weeks, though i have stopped smoking regularly and have only smoked maybe 3 times in the past 3 weeks i want to be sure i pass and am very sure they test for all those things that either mask or attempt to clean out your system in a day. I am already considering taking niacin. I found this article online the other day, tell me if you think this is even possible that this might work because it sounds a little far fetched to me. Ok theres this stuff Rating: 5