Citric Acid. Should be just fine, apart from citrus allergy.
Other preservatives and nitrates. I'm weary about those, i.e. I try not to eat much. As an example, so far I haven't seen a good counterproof against the Hawaiian nitrate study [1]. If alternatives without such preservatives are available I will choose those (and instead take care to eat it quickly).
Artificial Flavouring. I try to limit these since it tricks me into eating more.
Vitamins. Don't care if they're in there, but I won't buy a product just because of added Vitamins - I'm eating enough fresh produce.
Things that make the product look/sell better but give me no benefit, e.g. food colouring. I'm trying to avoid those, it's probably fine but I don't see why I should eat something my body hasn't been exposed to during human evolution that doesn't have any benefit.
[1] http://jnci.oxfordjournals.org/content/97/19/1458.full.pdf