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Q: I used zinc oxide cream under my breasts, and it helped tremendously to heal up a red, itchy rash. It also set off the metal detectors at the airport. The next time I flew, I didn’t use the cream ...

Walk down any skincare aisle and you’ll notice something interesting happening – zinc oxide is everywhere. From high-end mineral sunscreens to drugstore diaper creams, this white powdery ingredient ...