AP39 is primarily used in scientific research to study the effects of hydrogen sulfide (H₂S) in biological systems. It is a mitochondria-targeted compound that slowly releases H₂S, which plays a role in cellular signaling and protection. Researchers use AP39 to investigate its potential therapeutic benefits in conditions involving oxidative stress, such as cardiovascular diseases, neurodegenerative disorders, and inflammation. It has shown promise in protecting cells from damage and improving mitochondrial function, making it a valuable tool in understanding H₂S-related mechanisms and developing future treatments.