Used primarily as a tracer in research studies, sodium nitrite-15N helps in understanding nitrogen metabolism and the nitrogen cycle in biological and environmental systems. It is particularly valuable in isotopic labeling experiments, where it aids in tracking the movement and transformation of nitrogen compounds. In medical research, it is employed to study the role of nitrite in physiological processes, such as vasodilation and its potential therapeutic effects in cardiovascular diseases. Additionally, it is utilized in analytical chemistry for the calibration of instruments and the development of methods for detecting nitrite levels in various samples. Its application extends to agricultural studies, where it helps in analyzing nitrogen utilization in plants and soil, contributing to more efficient fertilizer use and sustainable farming practices.