Do you know what's in shredded cheese?

I made a rookie mistake the other day and learned the hard way that all cheese may not be cheese.  The string cheese that my son has been eating without issue is made from milk, enzymes, and salt.  However, the shredded cheese that I foolishly fed him consists of milk, enzymes, salt, potato starch, cellulose powder, calcium sulfate, and natamycin.  Turns out natamycin is an antibiotic used to treat fungal infections, and in the case of cheese it's to prevent mold.  Apparently it's also a medication for use in the eyes, and the possible side effects include:  Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue.)  Fortunately, it was just the hives and itching that my son experienced which were cleared up with a benedryl.  It's just so unbelievable all the crap added to food.  There's just not an eloquent way to put it.  We NAET treated for this "cheese", not because I want to continue feeding it to him but because it will be almost impossible to avoid at some point. I can see how this will be an uphill battle with a food as simple as pizza.  Each place will have it's own unique ingredients, with it's own additives added in. Why can't cheese just be cheese?!