Not sure. I sometimes add a bit of citric acid to my (unflavored, vapeable strength) base to smooth it out, but I only do that when starting a new 120ml bottle, so storage has never really been a factor.Thanks Ros!! let me ask do we store it the same way as regular nic?
That said, I would imagine the standard advice is still appropriate: First and foremost, keep it cold (freezer is best for unflavored base) and glass bottles look to be somewhat better than plastic.