I recently saw my dermatologist for another issue, and I asked her about my splitting nails. She suggested that I take biotin, and she also mentioned a topical product called Genadur, it requires a prescription. It's made by a Swiss manufacturer, in Italy. Its water soluable, but the reviews on line were really good. However, very pricey and not covered by insurance. Has anyone used Genadur, and what results did you have. There is a similar product sold on Amazon (ships from Europe) that is about 10% of the cost of Genadur that also has very good reviews. I'm tempted to try it first. Any information you might have would be appreciated.