 Anything special we have to do to preserve it to prevent it from going bad? Or does it hold its own pretty good once it's diffused into the oil? You think of olive oil, for instance. Olive oil does have a bit of a shelf life. After a while, it will go. If you're worried about that, you can always store it in the fridge. Good advice. Very relevant, too, this time of year because I know all of us, I'm looking at my arms as we're talking. I've got scratches and bites and all kinds of things going on.