Most anyone who works much with fabric will have similar problems. I buy a tiny little bottle at a big price (about $6) at a beauty supply place called Reconstruct made of different oils and used to renew and reconstruct. You can really, really see a difference in the strength of your nails after a short while. I put this around the nail bed and rub it in at least twice a day or after showers, dishes, etc. I also rub plain oil (such as baby or olive or even PAM) into my nails and hands before bed.
And, I like Aveeno for dry skin cream, which is not greasy and stays on until you wash it off ... unlike some other skin lotions and creams.
If I slack off on these things my nails will immediately split, shale and hang nails appear, nails are soft and round over my finger tips, etc.
Best of luck!