Biotin is a B vitamin. It's water-soluble and can't be kept, so you must drink it everyday. It strengthens hair and nails. It also supports the nervous system.
These are advertised as an easy way to grow nails, but frequent use can weaken them. If you want to wear them, give your nails a rest between applications.
Apply hand cream to your nails after removing polish or if you feel dehydrated. Every time you wash your hands.
Saw-like nail filing weakens nails. Sort them instead. Filing too much on the sides might weaken the nail.
Eat a balanced diet and take a multivitamin with minerals. Vitamin and mineral deficiencies may harm your nails and body.
Oversoaking may weaken and brittle your nails. Wash dishes with gloves and bathe without your hands.
Nail health requires enough water intake. Nails may crack and peel without enough moisture. Water keeps them hydrated and robust.
Nail polish is beautiful, but it needs to breathe. Polish weakens nails, even nontoxic polish.
Use a paper clip or your fingers to open a drink can. Breakage and chipping from using nails as instruments might weaken them.
Shorter nails are less prone to chip, fracture, or split, keeping them robust.