RETHINK ZINC A couple of decades ago, zinc—in the form of zinc lozenges—became extremely popular as a remedy for the common cold and even for flu.  The lozenges were important because zinc needed to dissolve slowly to coat the mouth and throat, where a cold or flu virus thrives. Many people still pop a daily dose of zinc as soon as cold or flu symptoms occur and some folks even take them regularly as a cold and flu preventative throughout the winter.  I haven’t been one of these.  However, I just read an online Harvard University article that’s making me...