Oleic acid is a monounsaturated fatty acid found naturally in several food sources, including olive oil, avocados, and nuts. It is also used in the cosmetic and pharmaceutical industry. Oleic acid is valued for its moisturizing, emollient and skin softening properties. It is used in skin care products, such as creams, lotions, and balms, to help lock in moisture, improve skin texture, and strengthen the skin barrier. Moreover, it is also used in pharmaceuticals as an excipient and in topical formulations for its penetrating properties.