The antioxidant values of foods listed are expressed in ORAC (Oxygen Radical Absorbance Capacity) units, a unit of measurement for antioxidant content which was originally developed by the National Institute on Aging (NIA) at the National Institutes of Health (NIH).
You can browse foods alphabetically to find their ORAC values, or if you want to get straight to the best antioxidants and purported anti-aging “superfoods”, you can view them sorted by their ORAC values – higher values imply a higher measured amount of in vitro antioxidant activity.