Another great product from the House of Keratin Research you will not be disappointed. Money back guaranteed as always :-). Nailvive will harden and strengthen your nails but may not repair existing cracks and/or broken nails. New growth should be visibly strong and healthy. There is no formaldehyde or Formaldehyde Resin or other bad ingredients that are not healthy for you. Nailvive contains powearful blend of Silk proteins that act immediately, you will actually feel it working!. There is nothing like it in the world this new proprietary formula is acting Super fast on your nails. Your nails will get harder and stronger right before your eyes. No need to waste your time on products that don't work or work temporary. Nailvive Nail strengthener- Developed with Advanced Polypeptide Technology. Soft and fragile nails will quickly strengthen within days you will feel that your nails are already hard and strong.