Can Black Licorice be bad for you? According to the FDA: Yes.
The Food and Drug Administration reports that the candy contains glycyrrhizin, a sweetening compound that comes from licorice roots. The problem with glycyrrhizin is that it leads to the decline of potassium levels in the body. So when the body is low in potassium, not only can abnormal heart rhythms occur, but also high blood pressure, edema, lethargic tendencies, and even congestive heart failure.
Black Licorice has been linked to health problems in people over the age of 40. They can even end up in the hospital if snacking on black licorice for two weeks at 2 ounces a day!
The FDA has issued a few warnings that should be kept in mind this holiday season:
Who would have thought candy could be the scary thing about Halloween?