The best nail strengtheners can completely change the way your nails look and feel, especially if yours tend to snag, peel, or chip easily. However, after testing nail strengtheners consistently, I noticed my nails felt harder and stronger—and the results held up over time. “Topical nail strengtheners provide essential nourishment and shield nails from damage,” says Ashley Magovern, MD, a board-certified dermatologist and the medical director of Dermstore.