1) Yes, synthetic urine has a shelf life. Anywhere from 18-24 months. You can always test your synthetic batch with a validity test kit to see if the urine constituents (creatinine, pH, S/G, etc..) are within satisfactory ranges. Do a Google search for "drug adulteration test kits".


2) Niacin is an ancient myth. It does nothing to help pass a U/A.

3) A no-brainer - the more you toke, the more THC is in your system.

4) See #3


Each persons body is different. Therefore, cleanout times vary from user to user.
What you should do is pick up some home THC test kits and test yourself periodically so you'll have an idea how long it would take for you to finally test negative. For each testing session, be sure to use the first urination of the day.
Burnt Toast Reviewed by Burnt Toast on . Couple Quick questions 1. Does synthetic urine have a shelf life? I have some but I do not know the brand anymore because I threw it away like an idiot. It is in your standard plastic synthetic urine bottle and it came with two hand warmers and the temp strip. It also came in a black square box. 2 I have been smoking on and off and I only take one hit at a time. Last time I smoked was a week and a half ago...then on 4/20 and then a few days before that. All one hit each day.........I should have a drug test in Rating: 5