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life of unflavored nicotine liquid is limited by the life of the PG
and/or VG that it is mixed with. According to Dow Chemical, PG
USP/EP has a shelf life of two years when stored below 40°C (104°F) in
closed containers away from sources of ultraviolet (UV) light. VG has a very limited shelf life, and again according to Dow Chemical, given its severely limited shelf life, extracts made from Vegetable Glycerine typically have a shelf life of 14-24 months. Here is a link to VapersClub which has an excellent collection of information on PG VapersClub
- What is the storage life of unflavored Nicotine Liquid?