Hi Parti, do you have any deficiencies? E.g. calcium? Are you anaemic etc? Which nail strengthener did you try? I would highly recommend OPI Nail Envy and make sure you use cuticle oil twice daily. I recommend CND Solar Oil - make sure you put this on the cuticle area, the sides of your nails and your nail itself. Massage all over the nail and cuticle/side area. This will give your nail nourishment and make it more flexible and less prone to splitting or breaking. Use in conjunction with Nail Envy and see how you get on.