Strength is beauty and OPI delivers strength with its range of Nail Envy natural nail strengtheners. OPI has developed a different formula to meet your individual needs. OPI Nail Envy Original is natural nail strengthener that provides maximum strength with hydrolysed wheat protein and calcium for harder, longer, stronger, natural nails. Ideal for weak, damaged nails. Original Nail Envy should be applied every other day. It can be used as a top coat and base coat.