I have some that I've had for years. I just found some fo's from Tony's Fragrance oils and they haven't been Tony's in like 5 years LOL But the fo still smells as true and wonderful as the day I first got it.
According to Brambleberry, here's what they said about the shelf life of their oils, "We recommend using our fragrances oils with in a year of purchase. However, they will not go bad in the sense that they will grow mold or go rancid (since they are not diluted in any other oils). After a year, the scent may start to change, losing its top notes first. If the scent does start to change years down the road it's still 100% safe to use."
Really, that should be the normal response from any good fo supplier.
I keep all my fo's in amber colored glass bottles in a dark cool area, like soapcakes. I heard somewhere from a supplier, can't remember which one at the moment, not to refrigerate fo's or eo's because extreme temperature changes can break down the oils easier. I don't know if that's true or not though.
