Co-production, in the field of mental health, aims to bring together academic and clinical researchers and those with lived experience. Often, research projects informed by this methodology involve the meeting of opposing attitudes, whether to the legitimacy of psychiatry, determinants of mental ill health, or the most appropriate interventions. This has meant that whilst some have reported positive experiences of co-production, many people with lived experience of mental ill health, sometimes referred to as ‘experts by experience’ (EbE), report harms which have taken place or been perpetuated during co-produced research projects. In the literature, nearly always, this is understood as a kind of epistemic injustice in Miranda Fricker's sense. In this paper, I argue that whilst Fricker's view does provide a plausible explanation of what's at play, we can gain more insight into the structural factors which exclude EbE by applying a framework of epistemic oppression. By highlighting the systemic and structural factors which work to keep certain knowers and their contributions out of our collective epistemic resources, we begin to understand the enormity of the task required to redress injustices in our knowledge production systems.