In this work a meta-policy on health promotion is analysed, through content analysis of documents and interviews to stakeholders, with the aim of understanding the use of evidence and the knowledge conversion process in a multi-actor policy trajectory. We study the different sources of evidence and their interaction. Among our results, we describe a process of document analysis and classification which leads to the definition of mediated use of research evidence. The analysis of the policy trajectory helps to identify when the use of evidence is driven by the local level, and to recognise "pivot" individuals in the policy development.