The invention relates to a method for producing an extract containing at least 40% (m/m) of polyphenols from Cistus creticus L., said method comprising the following steps: plant parts are extracted from Cistus creticus L. using an extraction agent selected from the group comprising water, alcohols and mixtures thereof； the extraction residues are removed； the extraction agent is at least partially removed； redissolution is carried out in an aqueous solvent and the undissolved constituents are removed； and selective enriching is carried out by means of either a) a two-phase extraction, and b) a membrane filtration.
