GYY4137 morpholine salt is widely used in research settings to study the biological effects of hydrogen sulfide (H₂S), a gasotransmitter involved in various physiological processes. It serves as a slow-releasing H₂S donor, making it valuable for investigating the role of H₂S in cardiovascular health, inflammation, and cellular signaling. Researchers utilize it to explore its potential therapeutic applications, such as protecting against ischemia-reperfusion injury, reducing oxidative stress, and modulating blood pressure. Additionally, it is employed in studies related to cancer, where H₂S is examined for its dual role in both promoting and inhibiting tumor growth. Its controlled release properties make it a preferred tool for mimicking physiological H₂S levels in experimental models.