The potent in vitro antioxidant ellagitannins from pomegranate juice are metabolised into bioavailable but poor antioxidant hydroxy-6H-dibenzopyran-6-one derivatives by the colonic microflora of healthy humans. - Cerda,B.; Espin,J.C.; Parra,S.; Martinez,P.; Tomas-Barberan,F.A. (European Journal of Nutrition, 2004)