nothing special...i take multivitamins (with calcium in); make sure you file your nails regularly (even after cutting, both sides from the outside in, and the sides of the nail where your problem is); i find a squared tip nail that is fairly short to begin with is best for strength and getting your nails to thicken while growing (and it may take a few months); a nail strengthener and at least a clear coat of gloss on top - repeat at least x2 weekly; and never, ever have any fake nails done (by you or a salon) as they just trolley your nails - you either have to keep getting them done and the nails need to breathe a bit! i bit my nails and fingers until i was 27 and it took a couple of years to get them right....i do them regularly and my favourite look is silver tips (instead of white ones) and clear gloss. i get loads of compliments, do them myself perfectly (it does take a bit of practice) and they take work. never do the washing up or immerse your hands in water for longish periods (get a man to do it!), use a good hand cream and if you have a particular issue there is usually a solution. the side of the nail is usually the first to go as you do catch them on things and mine usually get ripped there too....be conscious of this and i do things like take washing out of the machine more carefully or use door handles slightly differently to ensure i don't catch my nails....... :o)