A potent skin-soothing ingredient known as a triterpene, it's especially when used in synthetic rather than natural form. Oleanolic acid also functions as an antioxidant. This ingredient is in a wide range of food, medicinal herbs, and plants.
References for this information:
European Journal of Pharmaceutical Sciences, October 2012, pages 549-555
Folio Histochemica et Cytobiologica, Volume 4, 2011, pages 664-669
Journal of Ethnopharmacology, December 1995, pages 57-68