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Clinical studies have shown health benefits from consuming cranberries in many forms when the level of the active ingredient is optimal.
Proanthocyanidins are phytonutrients believed to be the active components in cranberries thus supporting a healthy urinary tract.1,2
Studies show consuming 10-16 ounces of cranberry cocktail, 1-10 ounces cranberry juice, or 500-1,600 mg of cranberry extract is beneficial for general urinary tract health.3
The United States Department of Agriculture (USDA) has measured and evaluated the antioxidant activity of several foods including blueberries and cranberries.
The chart was composed using data provided in USDA 2007 report. Please note that while both cranberry and blueberries have antioxidant properties, the mechanisms of action for their actual health benefits are somewhat different.