Applying Vicks VapoRub to fungus-infected toenails can clear up the notoriously hard-to-treat condition. Michigan State University clinicians found that applying the product daily to the infected nail cleared the condition in 32 of 85 patients, though it took anywhere from 5 to 16 months. While the study had notable weaknesses, it nevertheless suggests that VapoRub's efficacy may at least rival that of more costly, prescription topical medication. Oral antifungal drugs are more effective, but they can cause serious side effects. While further research is certainly needed, our chief medical consultant says that VapoRub--or Meijer's Medicated Chest Rub, which contains the same mix of eucalyptus, menthol, camphor, and other oils--is worth a try.