HealthWatch is a UK charity which was registered in 1991 to promote evidence-based medicine, quality information about health, and fair tests of health treatments. These principles save lives. Biased information resulting from selective publication of data has resulted in thousands of unnecessary deaths. Furthermore, non-publication of data is a violation of the informed consent process in which patients agree to take part in research believing it to be for the advancement of medical science. Those responsible for making healthcare decisions need to have at their disposal all possible evidence, which means they need ready access to all data resulting from fair tests of treatments. For these reasons HealthWatch is pleased to add its support to the AllTrials campaign.