Rich metadata is required for a comprehensive description of research assets. We developed a metadata schema for clinical and epidemiological research studies based on existing generic and domain-specific metadata vocabularies. It forms the basis for various search and data management services. Interoperability remains a challenge, as various health research standards are to be supported in the medium term. At the same time, embedding our infrastructure in national and international initiatives requires the use of overarching syntactic and semantic standards and vocabularies. In this paper we present a prototypical implementation in CEDAR Workbench. This not only provides a graphical web interface for collaboration and a possibility for form-based data entry for testing purposes. CEDAR also enables the use of standard vocabularies, annotation of concepts with medical terminologies, and a serialization in an RDF-JSON format.