I see ads for collagen powder and supplements everywhere now, and my sister swears by it for fighting wrinkles. Does it actually help prevent aging? What exactly is collagen? Dawn Marie R. Davis, M.D.
DEAR MAYOCLINIC: I’ve heard about the new over-the-counter hearing devices, but I’m not sure if they’ll work for me. What do I need to know? And what should I consider as I make my decision?
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