Developed by the National Institute on Aging, ORAC, or Oxygen Radical Absorbance Capacity, is a method of measuring the antioxidant potential of various foods.

Antioxidants are chemical compounds or other substances that protect cells from damage.

ORAC value reflects the potential ability of an antioxidant compound to scavenge free radicals–highly reactive atoms that can disrupt normal cell function and lead to cell damage. The greater the ORAC value, the greater the antioxidant's potential ability to disarm free radicals.

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