beta-carotene: an isomer of carotene that is found in dark green and dark yellow fruits and vegetables
provitamin a: an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver
oleic acid: a colorless oily liquid occurring as a glyceride; it is the major fatty acid in olive oil and canola oil; used in making soap and cosmetics and ointments and lubricating oils