This article presents the first empirically-based and theoretically-informed investigation of the effectiveness of the ‘self-declaration model’ of legal gender recognition in Denmark, the first European state to adopt it. Drawing upon analysis of legislative materials, as well as interviews with stakeholders in the legislative process and trans and intersex legal subjects, it contends that self-declaration is not without its limitations. By conceptualising embodiment as an ontological and epistemological process of becoming, and emphasising the institutional dimensions and effects of such processes, (...) it demonstrates that self-declaration may not address the complexities of legal embodiment, particularly concerning restrictions on trans and intersex people’s access to health care. The article’s empirical findings are directed towards the policymakers and activists tasked with shaping reforms of gender recognition legislation in the UK and elsewhere. The analytical agenda it develops may be adopted, and adapted, by scholars working in this area and other regulatory contexts. (shrink)