1. Take a biotin supplement
Biotin (also known as vitamin H and vitamin B-7) is one of the B vitamins. Because it’s water-soluble, it isn’t stored by the body, so you have to ensure that you consume it daily.
2. Minimize exposure to water
Too much soaking in water can cause your nails to become weak and brittle. Wear gloves when washing dishes, and try to keep your hands out of the water while taking a bath.
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Source :https://www.healthline.com/health/how-to-strengthen-nails#10.-Use-lotion-on-your-nails