You need B Complex. It will make the nails strong & stop most nail issues. I have done vitamins and herbs for over 25 years and you need some supplements. If they are chipping, peeling, cracking or break easily, it shows a general nutritional deficiency and insuffiecient hydrochloric acid and protein. You also need minerals. Most drs. won't prescribe these things. You can also apply pretrolleum jelly on each nail and rub it in and it will help strengthen them. But to solve the other issues, you need some supplements.