Prev3 of 3Next post 9. Increase Biotin Intake To enjoy strong and beautiful nails, increase your biotin intake. This water-soluble B vitamin helps build nail thickness and hardness, while reducing the chance of splitting. On the other hand, insufficient biotin intake can lead to brittle nails and excessive dryness. Eat more foods rich in biotin, such Ongles Plus Forts, Ongles Forts, Fingernails, Toe Nails, Gel Manicures, Pedicures, Pedicure Nails, Coffin Nails, Acrylic Nails