The invention relates to the use of an active substance complex for creating biological parts, in particular organs for living organisms, with the following components which differ from one another and are specifically adapted to the respective biological part which is to be created, namely at least one structural component based on extracellular material specifically adapted to the cells of the respective biological part which is to be created, at least one recruiting component, at least one adhesion component, and at least one growth and/or maturation component for producing an endoprosthesis implant. The outer surface (I) of the endoprosthesis is coated at least partially with the active substance complex. In addition, the endoprosthesis has at least one cavity (II) which is filled with the active substance complex. In order to reduce the amount of active substance complex needed for filling the at least one cavity (II), the active substance complex can additionally be applied to a further support material such as collagen or a suitable polymer.