This nail strengthener with a multi-tasking formula infused with vitamins A and E covers all your bases in one bottle. Consider it a 3-in-wonder. Base coat: Protects against discoloration. Top coat: Delivers long-lasting shine. Strengthener: Helps protects nails against chipping, peeling, and splitting when used daily. This OPI Nail Envy Strengthener is a multi-tasking formula infused with vitamins A and E that covers all your bases in one bottle. Consider it a 3-in-wonder. Base coat: Protects against discoloration. Top coat: Delivers long-lasting shine. Strengthener: Helps protects nails against chipping, peeling, and splitting when used daily. Add this quick drying formula to your manicure as the perfect base, for a glossy finish and amazing shine or to ensure your manicure has long lasting durability. Vegan and 9-Free.