Abstract
The World Medical Association's Declaration of Helsinki (DoH) serves as a key document of ethical guidance advocating principles of medical research involving human participants. Since its inception in 1964, the DoH has undergone several revisions, reflecting a dynamic evolution in our understanding of research ethics, spurred by gaps identified within the document, harms discovered, challenges identified during ongoing research activities, scientific advancements and societal shifts in values. The DoH addresses a challenge and a conflict that may arise between two key aspects of medical research: On one hand, the fundamental obligation of physicians to do no harm, and on the other, the essential need to ensure the efficacy and safety of medical interventions by testing them on human research participants or healthy volunteers. With each revision, increasing emphasis is given to distributive justice and beneficence and not only to patient autonomy. Despite being a comprehensive and concise document, occasional criticism is reported, such as with regards to the impracticability of obtaining informed consent amongst other challenges. This essay will examine the key changes across the DoH's iterations, highlighting the progressive strengthening of participant protection and the evolving relationship between research, societal benefit, and individual rights.