Olive, i can't remember what happened when i had it as a kid (my parents had a "it's doing more good than harm" attitude) but a few years back i was given it again and had a nasty reaction. i was really sick, so not sure how much was from the Ab and how much was that - but i was an emotional wreck, and ended up losing consciousness when i tried to get out of bed. Ended up in hospital and Ab's were swapped. They can't confirm what happened, but suggested a sensitivity to it and that i should tell hospitals/GPs i'm allergic to it, just in case