Fructo-oligosaccharide enhanced bioavailability of polyglycosylated anthocyanins from red radish via regulating gut microbiota in mice

•FOS increases anthocyanins of red radish bioavailability.•Co-ingestion of FOS and ARR show higher antioxidant activity than ingestion alone.•FOS promotes anthocyanins hydrolyzing as anthocyanidins.•Bacteroides plays an important role in FOS increasing ARR bioavailability.