Pharmaceutical or dietary composition containing, as active ingredients, at least one short-chain fatty acid or salt, ester and/or amide thereof, in combination with a complex sugar and/or dietary fibre. The complex sugar and/or dietary fibre is selected from inulin, pectin, dextrin, maltodextrin or derivatives thereof and with one or more pharmacologically acceptable excipients. The composition has (a) a matrix consisting of lipophilic compounds with a melting point lower than 90° C. and optionally amphiphilic compounds in which the active ingredient are at least partially incorporated, (b) an amphiphilic matrix； and (c) an outer hydrophilic matrix in which the lipophilic matrix and the amphiphilic matrix are dispersed.
