Topical application of oleic acid on its own or in the form of olive oil has been shown in studies to weaken the skin's barrier; however, when oleic acid was mixed with other fatty acids and skin-benefiting ingredients such effect was not demonstrated. On the positive side, this barrier disruption may improve the penetration of other ingredients found in the product. Interesting, when oleic acid is mixed with other lipids (fats), oleic acid is effective for reducing symptoms of dryness and sensitivity. See also: Fatty Acid Olive Oil