“Allergens, they’re composed of proteins and/or polypeptides, which are large and complex molecules. These molecules simply don’t exist in essential oils, because of the way they’re made (distilled, pressed, etc.) So when someone claims they’re allergic to an essential oil, there are generally two possibilities: 1) they’re not using a pure oil and the allergic reaction is being caused by something else in the product, or 2) they’re having an allergy-like reaction that’s caused either by sensitivity or the detox response of the body.”   http://www.skepticalhomeopath.com/2013/03/can-you-be-allergic-to-essential-oils.html

“There has never been a documented instance of an anti-body response to an essential oil. Essential oil antibodies have never been found or detected in anyone. Unless sensitization occurs and antibodies are produced and stored in the body, there can be no allergic reaction. Therefore, we can state unequivocally that essential oils are not and cannot be allergens. Sometimes people do have allergy-like reactions but these are not allergenic in nature. They are detox reactions.”  —The Chemistry of Essential Oils Made Simple,  http://www.amazon.com/gp/product/0934426996/ref=as_li_ss_tl?tag=dosk-20