Abstract: A method of preparing an extract of at least one active principle in the form of completely dry soluble granules wherein an extract of an active principle is prepared in a solvent medium and depositing the extract upon the internal and external walls of microporous carriers that are insoluble in the solvent, drying the impregnated granules, and coating the walls of the granules with a film forming polymer. The granules are a soluble dietary fiber based upon a polymer selected from the group comprising inulin and oligofructoses and, fructo-oligosaccharides separately or mixed.