Wow! I have often wondered if nail health is a nutritional issue but really was too lazy to get scientific about it. From as long as I can remember, gelatin was my mother's treatment for leg cramps and nail health. Amazing how iron is good for nails and leg cramps. It's a family thing in my case, my little sister was frequently woken by "egg lakes". Think like a 4 year old and you'll get it.
My problem is what I get my hands into, solvents. Acetone sucks the life out of my nails and many OTC rubbing alcohol and similar products contain acetone or something like it that dries nails and then the problems begin. Nails splitting or peeling off in layers like so much mica make for nails that snag on everything and my nails end up way too short. I use "Gelous" nail gel coat or "Nail Life" nail revitalizer. Being a guy, I have to defer to people who are the best experts, women. I am going on the advice of the ladies at Sally's beauty supply. I wouldn't know nail polish from lip gloss on my own. Sort of. I've had my toenails and finger nails done as many times a big brother could tolerate. I used paint thinner to get my nails clean of powder pink nail polish or whatever.
Thanks for the tip,
LL