Brittle/scraggly nails

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My nails have become brittle and scraggly and the skin around them isn't firm. Does anyone know what I could take to help? I have heard in the past that having a cube of jelly every day helps nails stay strong but am not sure if it does work.

Bump.

I've recently started taking multivitamins and there's a very noticeable improvement in my nails, hair and skin. People have commented without me saying anything about it.

Thank you so much, I will try that.