Common reason for fingernail pertinence is deficiency in B12,zinc and iron. I think taking a prenatal vitamin is a great idea. Also eating a healthy diet. Sometimes malabsortion.think that's the word of nutrients. Also drink plenty of water. Not just liquids. :-)

I started taking a prenatal and also because my doctor said it's a great vitamin for my body so I started about 6 days ago and I notice a difference already :) hope this helps.

I Take prenatal vitamins, hair skin and nails, and biotin all three have helped my hair grow back and be healthy and have helped my nails not be so brittle

Biotin
Hair Skin and Nails supplement
And I find instead of a multivitamin a Prenatal vitamin did me wonders
When I was first diagnosed my hair fell out and my nails split all the time
Had to cut my hair short and keep my nails trimmed these helped alot

Yes my nails are that way, I started taking a supplement called hair, skin, and nails.