(Concern) What nutrient deficiency causes nail splitting?

It's my fingernails. I've had issues with them since I was young.

Am I the white crescent shape?

There is also none of that.

 

 

It breaks easily and comes off completely like a shell.

Such areas break and crack easily because they lack strength in the nails.

There are many inconveniences in daily life.

Clothes also catch on nails, and sometimes when...

Washing my hair also causes inconvenience because hair gets caught.

Where should I start to improve my nail health?

 

This time, it's not about going up.

Splitting into small pieces is occurring.

 

It irritates me even when I put on clothes, so I think I'll just cut it with nail clippers.

 

What should I eat?