Polyphenol-rich fraction (I) derived from fruit of the Rosaceae family comprises at least 20% polyphenols including phloridzin in an amount of at least 10% by weight of total polyphenols. An Independent claim is also included for a process for producing (I), comprising either: (a) subjecting comminuted apples to one or more solid/liquid extractions, drying the solid residue and re-extracting the product with organic solvents； or (b) subjecting comminuted apples to one or more solid/liquid extractions, enzymatically liquefying the solid residue, and chromatographing the resulting liquid extract.
