Understanding these causes, which range from the effects of your diet and environmental variables to more serious health concerns, can help you make informed decisions about your nutrition and lifestyle, and when to seek professional guidance. This comprehensive look at nail health aims to equip you with the information you need to maintain not only beautiful nails but also a healthy body. Biotin, a B vitamin, is essential for the health of your hair, skin, and nails. A biotin deficit can result in brittle, easily splitting nails. Biotin-rich foods include eggs, almonds, cauliflower, cheese, mushrooms, sweet potatoes, and spinach. Dehydration can have a big influence on your nails, making them brittle and more likely to split. Drinking enough of water throughout the day helps keep nails flexible and strong