I am going to start by saying I believe sunlight, heat, air and moisture would be the enemies.
I don't believe there is necessarily a shelf life and certainly agree with sun vaporer on not keeping it in the fridge. The fridge can create moisture. I have a bottle of propylene glycol sitting in my window sill which is 95-99% of the ingredients in our liquid. My pg was purchased at a pharmacy and has no expiration date on it. I also never refrigerated my analogs( I understand there is other processes involved with the nic in analogs) chewing tobacco is not kept in the fridge. So I would say the nicotine is not that succeptible to spoiling.
Final verdict............if you keep your bottles full and downsize to smaller bottles after opening to keep the air out, keep it away from long term exposure to sunlight(dark place) don't let it get too hot(just because heat is never good) and keep it away from moisture which a fridge could certainly cause. There is no reason it couldn't last much longer.
cool, dark and dry
I don't believe there is necessarily a shelf life and certainly agree with sun vaporer on not keeping it in the fridge. The fridge can create moisture. I have a bottle of propylene glycol sitting in my window sill which is 95-99% of the ingredients in our liquid. My pg was purchased at a pharmacy and has no expiration date on it. I also never refrigerated my analogs( I understand there is other processes involved with the nic in analogs) chewing tobacco is not kept in the fridge. So I would say the nicotine is not that succeptible to spoiling.
Final verdict............if you keep your bottles full and downsize to smaller bottles after opening to keep the air out, keep it away from long term exposure to sunlight(dark place) don't let it get too hot(just because heat is never good) and keep it away from moisture which a fridge could certainly cause. There is no reason it couldn't last much longer.
cool, dark and dry