Displaying 10 results of Caffeine Stable Isotopes Caffeine stable isotopes are isotopes of carbon, nitrogen, and oxygen that are used to trace the origins and pathways of caffeine molecules in biological and environmental systems. By measuring the ratios of these isotopes in caffeine samples, researchers can determine factors such as the caffeine's source plant, growing conditions, and processing methods. This information can be used in a variety of fields, including food science, medicine, and environmental studies.