Bestatin hydrochloride is widely used in biochemical and medical research due to its ability to inhibit aminopeptidases, enzymes that play a role in protein metabolism and immune response modulation. It is particularly valuable in studies focused on understanding cancer progression, as it can suppress tumor growth by interfering with the activity of specific enzymes involved in cell proliferation and metastasis. Additionally, it is utilized in immunology research to enhance immune system activity by stimulating the production of certain immune cells, making it a potential candidate for immunotherapy applications. Bestatin hydrochloride is also explored in the context of infectious diseases, as it may inhibit viral replication and bacterial growth by targeting key enzymatic processes. Its role in modulating enzyme activity makes it a versatile tool in both therapeutic development and experimental studies.