Nourish weak, brittle nails with The Cure Ultimate Nail Hardener from Nailberry. Harnessing the powers of Acai Berry Extract and Antarctic Black Algae (rich in proteins and mineral salts), the rose-scented treatment repairs and restores nails to improve overall condition.Developed with innovative Oxygen Technology, the breathable, vitamin-rich formula allows air and water molecules through to nourish, strengthen and respect natural nails. Can be applied as a base coat to prepare for nail polish, or as an intense regenerating treatment to protect against breakage and splitting. Promotes a stronger, harder and longer nail bed.