OPI Nail Envy Original Nail Strengthener -Ideal for weak, damaged nails. Provides maximum strengthening with hydrolyzed wheat protein and calcium for harder, longer, stronger, natural nails! Weak, damaged nails are no match for OPI Nail Envy NAIL STRENGTHENER! Thanks to added calcium and protein, OPI Nail Envy NAIL TREATMENTS build manicure-ready nails that are harder, longer and stronger than ever before. All Nail Envy products can be used as a stand-alone treatment or as a base coat alternative.