The invention relates to a method for obtaining a composition based on conifer bark enriched in dihydroquercetin or in tannins, comprising the following steps:a) grinding dried shavings of bark from a conifer to obtain a ground particulate material of conifer bark, andb) selecting, from the ground particulate material obtained in step a), the fraction of particles: of smallest size representing at most 40% by weight, relative to the total weight of the ground particulate material obtained in step a), this fraction being enriched in tannins; orof largest size representing at most 50% by weight, relative to the total weight of the ground particulate material obtained in step a), this fraction being enriched in dihydroquercetin.