It's in fruits and vegetables naturally too. I'm not all that worried about citric acid. It's not like you're breathing in the mold. 

 The chemical structure is the same, but the manufacturer version has impurities and fragments from the mold (brave AI answer lol)

So same, but still different. Best to avoid 

 But yeah, I generally prefer no preservatives. Citric acid is one of the least offensive ones in my opinion.