The use of an effective quantity of a protein hydrolysate from plants belonging to the crucifer family, as whitening and/or depigmenting skin agent, for the preparation of a cosmetic and/or dermatological and/or pharmaceutical composition. In a preferred embodiment, the hydrolysate is obtained from rapeseed proteins. Also the composition may contain the aforementioned hydrolysate in a cosmetically and/or pharmaceutically acceptable excipient chosen between glycerol, propanediol and butylene glycol.
