Propylparaben
To slow molds, yeasts, and other microbes that spoil food, some companies use propylparaben—a form of benzoic acid. Unfortunately, this preservative may disrupt our endocrine systems, diminish fertility in women, and could even form a carcinogen (benzene) by combining with vitamin C. Although not banned in most of the US, propylparaben has recently been banned in California, and has been banned for use in food in the EU since 2006.