Nail Envy Original Nail Strengthener - BenefitsNails are 95% stronger in 1 week9 FreeFeaturesOPI's iconic nail strengthener now features Tri-Flex Technology to strengthen and protect nails against chipping, peeling, and splitting. The result? Healthy-looking, beautiful nails that are 95% stronger in 1 week.*Also infused with biotin, calcium, vitamins A, C, and E, this formula strengthens and protects against chipping, peeling, and splitting, resulting in healthy-looking, beautiful nails - Nail Envy Original Nail Strengthener