Even if you aren't sure what parabens are, you've surely heard by now that they're bad news. These days, it's common to hear brands across all beauty categories condemning them, but according to Thurston Scott, keeping these potentially toxic preservatives out of makeup should be the norm. "The main issue with parabens is that they are endocrine disruptors," she explains. "They can stay suspended around the skin pores in your eyes and can affect your hormone system. They're considered carcinogenic even in small amounts." No thanks!