SOTO-DOMÍNGUEZ, A.; GARCÍA-GARZA, R.; RAMÍREZ-CASAS, Y.; MORÁN-MARTÍNEZ, J. & SERRANO-GALLAR- DO, L. B. The aqueous extract from oregano (Lippia graveolens HBK) from the North of Mexico has antioxidant activity without showing a toxic effect in vitro e in vivo. Int. J. Morphol., 30(3):937-944, 2012.