In vitro antiproliferative, apoptotic and antioxidant activities of punicalagin, ellagic acid and a total pomegranate tannin extract are enhanced in combination with other polyphenols as found in pomegranate juice - Seeram,N.P.; Adams,L.S.; Henning,S.M.; Niu,Y.; Zhang,Y.; Nair,M.G. (J Nutr Biochem, 2005)