Nail strengthening treatment for nails naturale on the part of OPI The basis for strengthening natural nails OPI gives strength to nails and acts as a protective barrier between your nail naturale and color to prevent pigmentation and stains. Infused with vitamins A and E, strengthening natural nails with wheat protein and calcium strengthens nails, helps prevent discoloration, and repairs damaged nails. Use alone or as a base under color to give more strength to your manicure. Benefits: | Vegan formula free from ingredients or derivatives of origin animale. Contains vitamins A and E.