The more monoterpenes an oil contains, the shorter its shelf life. Most citrus peel essential oils, except Bergamot, consist of 90% or more monoterpenes, and thus are oils that have the shortest shelf life.
Essential oils which contain a lot of monoterpenes or oxides have the shortest shelf life, of approximately 1-2 years. Essential oils which contain a lot of phenols may last up to 3 years. Essential oils which contain ketones, monoterpenols, and/or esters have a shelf life of 4-5 years.
Essential oils do have a shelf life, and unfortunately, it's not a blanket amount of. and become cloudy as they oxidize or expire, especially citrus essential oils.
Today, we examine the claims made for essential oils shelf life.. does not usually produce the unpleasant odor (though oxidized citrus and other essential oils .