endogenous
adjective medical, social science specialized uk/enˈdɒdʒ.ɪ.nəs/ us/enˈdɑː.dʒə.nəs/
（系统、人体或思维）内生的，内源的
found or coming from within something, for example a system or a person's body or mind
Endogenous insulin levels decrease over time in people with type 2 diabetes. 二型糖尿病患者体内自生胰岛素水平会逐渐降低。
Opposite: exogenous