Cyclosporin H is primarily used in research settings to study the mechanisms of immunosuppression and cellular processes. It serves as a valuable tool for investigating the role of cyclophilins, a group of proteins that play a significant part in protein folding and immune regulation. In laboratory studies, it is often employed to inhibit cyclophilin activity, helping researchers understand its impact on T-cell activation and other immune responses. Additionally, Cyclosporin H is utilized in experiments exploring its potential effects on viral replication, particularly in HIV research, due to its interaction with host cell proteins. Its applications are largely confined to experimental and preclinical studies, contributing to advancements in immunology and virology.