I have very thin, weak nails and pretty thin hair. I've read online that taking a pre-natal vitamin supplement will harden nails and thicken hair. Does anyone have any experience with this product?
Also, any advice for getting thicker nails and hair for those of us who aren't blessed with them genetically...?

Oh, almost forgot, I'm not referring to to hair loss or thinning hair, because I'm pretty sure you can't get that back without expensive procedures, no?
I'm just talking about naturally thin hair/nails.