• A class of vitamin E compounds naturally found in many different sources, such as oils, nuts, and vegetables. Tocopherols have antioxidant activity.
  NCI
  U.S. National Cancer Institute, 2021
• Class of compounds having one to three methyl groups on a chromanol ring with a long saturated 12-carbon side chain with three methyl groups along the chain and two methyl groups at the end; may contribute to vitamin E activity.
  CRCH Nutrition Terminology
  Cancer Research Center of Hawaii, University of Hawaii, 2021
• Group of lipoid antioxidants composed of a bicyclic benzo-gamma- pyran ring system with one or more long aliphatic side chains; dietary requirement of rodents and other animals (but not humans) for normal reproduction, circulation, and muscle and other functions.
  CRISP Thesaurus
  National Institutes of Health, 2006
• A collective name for a group of closely related lipids that contain substitutions on the 2H-1-benzopyran-6-ol nucleus and a long hydrocarbon chain of isoprenoid units. They are antioxidants by virtue of the phenolic hydrogen. Tocopherols react with the most reactive form of oxygen and protect unsaturated fatty acids from oxidation.
  NLM Medical Subject Headings
  U.S. National Library of Medicine, 2025