This article investigates how healthcare professionals articulate the relationship between patient experience and ‘evidence’, creating hybrid forms of knowledge. We propose a Bakhtinian dialogical framework to theorise this process. Drawing on ethnographic work from patient involvement initiatives in England, we show how patient experiences are re-articulated by professionals who add their own intentions and accents in a dialogical process which incorporates diverse forms of knowledge and the conflicting demands of healthcare services. In this process, patient experiences become useful epistemic commodities, helping professionals to respond to workplace pressures by abstracting experiences from patients’ biographies, instrumentalising experiences and privileging ‘disembodied’ forms of involvement. Understanding knowledge as relational and hybrid helps move beyond the assumption that there is a clear dichotomy between ‘objective science’ and ‘subjective experience’. This article illuminates how new knowledge is produced when professionals engage with ‘lay’ patient knowledge, and helps inform the sociology of knowledge production more widely.