Menthol crystal oil is a clear, colorless liquid with a strong, minty odor. It is derived from the peppermint plant and is commonly used as a flavoring in foods, beverages, and oral care products, as well as in aromatherapy and personal care products. It also has a cooling sensation when applied to the skin. Due to its refreshing and invigorating properties, it is widely used in many products such as toothpaste, mouthwash, and vapor rubs.