My nails have been splitting for a year now.why?

Brittle Nails: Genadur is the first fda-approved treatment to help strengthen fragile, brittle nails. According to manufacturer medimetriks pharmaceuticals, genadur helps improve the condition with a once-daily brush-on application that may start showing results in as little as 14 days. While brittle nails may be the result of exposure to solvents in nail products, they may also be the symptom of a nail disease.