Cytostatin is a natural product primarily used in medical research and oncology due to its potent inhibition of cathepsin K, a cysteine protease involved in bone resorption, cancer metastasis, and cell proliferation. It exhibits anti-angiogenic properties by inhibiting new blood vessel formation in tumors, making it valuable for studying cancer cell behavior, mechanisms of cell cycle regulation, tumor growth, and signal transduction pathways. Additionally, cytostatin has potential therapeutic applications in cancer treatment, where it may slow or halt tumor progression and metastasis. Its role in modulating cellular processes, including protease activity and angiogenesis, also makes it a useful tool in biochemical studies focused on cellular metabolism. Current applications remain in the research and development phase, requiring further studies to evaluate efficacy and safety for clinical use.