My son recently reacted very badly with intense itching and a pimply pustule-like rash to the food additive flavour enhancer 635 - which I did not even know we'd been exposed to until after the event - by eating a store-bought seasoned BBQ chicken. I phoned the store, and they said they use the 635 in the seasoning and in a powder they sprinkle over the skin for flavouring. - Deb, Brisbane