Fetuin, derived from fetal bovine serum, is widely used in biomedical research due to its role in cell culture and tissue engineering. It acts as a growth promoter, enhancing cell proliferation and survival, making it essential for cultivating sensitive cell lines. Its ability to inhibit calcification is valuable in studying bone and mineral metabolism. Additionally, fetuin is utilized in vaccine production and as a stabilizer in biopharmaceutical formulations. Its anti-inflammatory properties also make it a candidate for therapeutic research in conditions like arthritis and metabolic disorders.