Cranberries are naturally rich in vitamin C and are commonly used by women to prevent urinary tract infections. Studies suggest this is due to compounds they contain called proanthocyanidins (phytonutrients). Our new High Strength Cranberry 12,000mg also contains 80mg of the antioxidant vitamin C to offer additional immune protection. Vitamin C is a potent antioxidant that is believed to help neutralize free radicals that can damage healthy cells in the body.