The endocrine system is a group of glands that secrete hormones into the circulatory system. The endocrine system helps to maintain homeostasis by regulating the organs of the body. Endothelial cells, smooth muscle cells, epithelial cells, and fibroblasts are essential components necessary for the normal function of the endocrine cell system. Atypical cell proliferation and regulation within the endocrine system contributes to the development of hypothyroidism, hyperthyroidism, diabetes, hypogonadism, and cancer. We offer different types of normal human primary cells in the endocrine system.