Nourishing Nail Pen. Key Ingredients: Highly concentrated formula with castor oil. Vitamin E. Pistachio extract. Deeply rehydrates and revitalizes nails. Nourishes and softens cuticles. Key Ingredients: Pistachio extracts: Significantly hardens and strengthens the nail. Castor oil: Deeply hydrates the nail and surrounding area. Vitamin E: Protects from external damage. Sunflower oil: Nourishes and protects the nail from breakage. Research Results: *After 3 weeks:. 89% nails are repaired. 89% nails and cuticles are strengthened. 89% cuticles are softened. *Tested under dermatological control. *Dermatologically tested on a panel of 25 people over 21 days.