Walnut oil is a type of oil extracted from the nuts of the walnut tree. It is known for its rich, nutty flavor and is often used in salad dressings, marinades, and cooking. The oil is high in polyunsaturated fats, particularly omega-3 fatty acids, which are beneficial for heart health. In addition to its culinary uses, walnut oil is also valued in cosmetics and skincare for its moisturizing properties. It contains antioxidants and vitamins that can help nourish the skin. However, it should be stored in a cool, dark place to prevent it from going rancid.