Hair, skin and nails

Can anyone recommend good products for skin and to strengthen hair and nails?

 

eating jelly.... (apparently)

and you can get this nail varnish stuff that makes your nails stronger that you leav on for 2 weeks then take it off, think its rimmel 7 day wear or something like that.

and hair im not sure lol im sure you can get shampoo for brittle hair though like herbal essences or something.

 

thank you

 

Pantene, Head and Shoulders, and VO5 have some really good products for hair.