HealthCreators got a reaction from Jane3797 in UK "E Numbers" to avoid
Today I read this article http://whole30.com/2015/03/label-reading/
The answer to your question is there:
"There are other additives (like guar gum or citric acid) that are generally safe for most, but may effect very sensitive individuals. Still other additives sound scary (like ascorbic acid), but are actually totally benign… that’s just the science-y name for vitamin C."