Abstract As a result of the UK’s withdrawal from the European Union (‘Brexit’), the UK can negotiate its own trade agreements for the first time in over 40 years. This includes the Comprehensive and Progressive Trans-Pacific Partnership Agreement (CPTPP). Public Health Wales undertook a mixed-method Health Impact Assessment (HIA) to assess the potential impact of the CPTPP on health, well-being and inequalities in Wales. It is only the second ever HIA carried out on a free trade agreement (FTA) globally. A literature review on the potential impact of the CPTPP on health was conducted. Qualitative interviews with cross-sectoral representation, such as the environment, were undertaken alongside the development of a community health and demographic profile. The HIA identified significant potential impacts across health determinants, e.g., employment, agricultural production and health care, as well as impacts on population groups, e.g., those on low incomes. The Investor State Dispute Settlement (ISDS) mechanism, economic uncertainty and loss of regulatory alignment were identified as potential pathways for health impacts to affect the population. The HIA highlighted trade as a key commercial determinant of health. The findings have been beneficial in informing policy and decision-makers to prepare for the implementation of the CPTPP and take action to maximise opportunities and prevent potential negative impacts. Communicating HIA evidence that links trade to health has also led to valuable cross-sector and cross-UK engagement and sparked a “rethinking” of trade through a well-being economy lens where health, well-being and sustainability are primary objectives. This work has demonstrated the value of a HIA approach to FTAs by mobilising a range of evidence through a transparent process, resulting in transferrable learning for others as well providing an entry point for public health to have direct engagement with trade negotiators and those participating in trade discussions. Key messages • Trade agreements are a key commercial determinant of health across health behaviour, policy and economy. • Multiple population groups are affected by trade agreements both positively and negatively.
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