I can't be anywhere near citronella as that closes up my lungs and swells my eyes.
I personally think this is the sensitivity of the individual using the oil. You may not have an all out allergy to something, but if tested, you may have a slight reaction. My massage therapist had to stop using grape seed oil because she was going home with a headache every night and couldn't figure it out until she changed.
I have only heard of OP alleviating allergies. OP simply takes the burden of dental bacteria from your body so that it has the resources to handle other issues.
But on another note, I have heard on Support Forums for the last two years that many people have suffered from allergies when before they hadn't. And people in my office in the SF Bay Area are also complaining these last two years of the same thing. Somethings in the air?....