I have upped my intake of veg including focus on 'green veg' like broccoli, spinach etc. as well a red meat - steak.
I now have gorgeous nails (or getting there) I have also been usingRimmel French Manicure 433 French Ivory covered by Rimmel Matte Finish top coat.
I have no idea what made a difference but these are the factors. I make sure that I use the matt coat on the ends and undersides of my nails.
I used to have gorgeous strong nails and then all of a sudden they turned into flaky, splitting stumps and I didn't know why.
I hope this helps someone because I mourned my pre DS nails.
Good luck and remember, always wear rubber gloves!