Fecha de publicación: 17/03/1993 Fuente: WIPO "royal jelly" An inexpensive method for preparing a clear and stable royal jelly solution with a simple process is provided. A clear royal jelly solution is produced by preparing an aqueous royal jelly suspension, adding simultaneously or sequentially two or more types of protease that differ from each other with respect to action sites of a substrate, and maintaining the suspension to a temperature above room temperature, thereby solubilizing the insoluble matters by enzyme reaction.