- For weak or splitting nails. This nail treatment helps frail thin nails grow long and strong. It contains calcium that protects while strengthening nails, preventing them from breakage. Contains Vitamin B3, Panthenol and Calcium. Thick gel coating for substantial protection. DBP, Toluene & Formaldehyde Free. For those who experience weak or splitting nails, the thicker gel provides a more substantial coating than a typical nail strengthener. This formula contains Vitamin B3 and panthenol which is Pro Vitamin B5 and is present in all living cells in the form of Panthenoic Acid. The presence of Panthenol promotes moisture retention which prevents drying and splitting of nails.