Cuticle oil is a moisturizing product for your nails and cuticles. It’s most commonly made up of vegetable oils and sometimes contains vitamins and citric acid. Cuticles that are exposed to excessive cold, sun, chlorine, or salty or soapy water can become chapped, cracked, and dry. In these cases of extreme dryness and damage, cuticle oil can help moisturize your cuticle and nail, restoring it to health.