Stable isotope analysis has emerged as a transformative approach in forensic anthropology, offering a chemical window into human identity, movement, and life history. By examining the natural variations of isotopes such as carbon, nitrogen, oxygen, hydrogen, sulphur, and strontium within human tissues, scientists can reconstruct dietary patterns, geographic origins, and migration pathways that traditional methods often overlook. Bones, teeth, hair, and nails act as chronological recorders-each preserving isotopic information from different periods of an individual's life. These biological archives have been instrumental in identifying unknown remains, resolving humanitarian cases, and providing crucial leads in criminal and disaster investigations. Despite challenges such as incomplete isotopic reference maps and post-burial alterations, advancements in analytical precision, microsampling, and isoscape modelling continue to expand its forensic potential. Ultimately, stable isotope analysis bridges chemistry and humanity, transforming atoms into evidence and revealing how every person carries within them a unique chemical signature of their life's journey.