Human Chorionic Gonadotropin (hCG) is a placental glycoprotein hormone secreted by syncytiotrophoblast cells during pregnancy, consisting of two non-covalently linked α and β subunits. The β-subunit (β-hCG) confers unique biological and immunological specificity, distinguishing it from other glycoprotein hormones (LH, FSH, TSH). hCG serves as the earliest pregnancy-specific biochemical marker and is critically involved in maintaining early pregnancy, trophoblast differentiation, and fetal-maternal immune regulation. This research-grade compound is essential for studying reproductive endocrinology, pregnancy-associated disorders, and trophoblastic tumor biology [citation:2][citation:6].