Do you use nail strengthener?

I don't get my nails done often, and I either don't wear nail polish at all or just occasionally apply clear nail polish.

My nails break or crack once they grow to a certain length. Is it because they are dry?

My fingernails are quite thick, so people around me even joke that they are bone.

It’s not that the fingernail itself has thinned, and there are no external changes at all, but as I go about my daily life, parts of it break off.

This happens quite often. In such cases, would using a nail strengthener help?

Please recommend any nutritional supplements that you have found effective.