Cranberries are very high in bioactive plant compounds and antioxidants, particularly flavonoid polyphenols.
Quercetin: the most abundant antioxidant polyphenol in cranberries.
Myricetin: major antioxidant polyphenol in cranberries
Peonidin: responsible for the rich red color of cranberries. Cranberries are among the richest dietary sources of peonidin.
Ursolic acid: concentrated in the skin, ursolic acid is a triterpene compound. An ingredient in many traditional herbal medicines and has strong anti-inflammatory effects.
A-type proanthocyanidins: called condensed tannins, these polyphenols are believed to be effective against UTIs