Nail nourishing serum

I have vertical lines on my fingernails.

I don't apply nail polish often, and I make sure to eat enough protein.

However, seeing the lines on my fingernails, I was worried that I might have an illness, so I even searched the internet.

I don't think it's a health issue.

I went to Daiso and looked around, and found a nail strengthener, so I bought it.

I hope that if I apply it consistently, my nails will be nourished, the nail lines will disappear, and my nails will become even prettier.