I just wanted to let you know I tried an Olive Leaf Extract (Tree of Health brand) that contains potassium sorbate (preservative E 202) .  I experienced migraines and mood disturbance.  I am sensitive to glutamates, but wasn't aware of any sensitivity to sorbates.  I have tried other brands of Olive Leaf Extract which I have not had a problem with.  I do not have a known salicylate sensitivity. - by email