To compare the antioxidant values of various foods and nutrients, scientists developed a unit of measure called ORAC (Oxygen Radical Absorbance Capacity). This scale is used to compare the antioxidant values amongst a variety of foods. The higher the ORAC rating of a substance the more Free Radicals it can neutralize.
Beware as you compare ORAC values. Always check to see that you are comparing gram to gram as show here.
Brunswick Laboratories. ORAC ratings may vary from batch to batch. All ORAC ratings are measured by Brunswick Laboratories and expressed as mircomole TE per gram.