What nutritional less cause splitting nail and toenails?

I have notice my toenails cracking in the center as they grow out

Answer:
this can be cause by a number of things. vitamin b defficiency, fastener fungus or a damaged pin bed. if it is the last entity then your nail will always crack as they grow out.

Deficiencies surrounded by minerals, mostly, affect nail strength:

cacium
iodine
silica
zinc

lack of folic acerbic biotin...amino acids...msm calcium and vitamin d

While it could be nutritional deficiency (usually withdrawal of calcium, iron, or protein is to blame if this is the case), it can also be nail fungus, injuries to the nail (stubbed your toes lately?), or even the soap or skin products you may use. Also, your nails can do chance things of the matrix is damaged; for example, I have a finger that was once sliced adjectives the way through in close proximity the tip (there's a scar underneath my nail from it), and immediately that nail other grows crooked, so it's reasonable that nail could also split depending on what kind of harm the matrix may have received.

withdrawal of minerals

iron