When you're sick, all anybody really wants is a little relief. Odds are, if you open your medicine cabinet right now, there is at least one bottle of neon-colored cough syrup—or maybe a pack of candy-like cough drops—or some other OTC special sauce to ease the head-pounding discomfort of an unwelcome virus. (And let's be real, they're all probably expired, but that's beside the point.) The irony is, you're probably really careful about what you put in your body in terms of food, but have you ever actually considered what's in your medicine? Those hyper-sweet flavors and neon colors definitely aren't natural, and they might actually slow down healing. Why? Because these meds are full of nasties.