Opioids that originate or are produced within the body, including endorphins, enkephalins, and dynorphins; antonym for exogenous opioids (e.g., heroin and opium).
« Back to Glossary IndexOpioids that originate or are produced within the body, including endorphins, enkephalins, and dynorphins; antonym for exogenous opioids (e.g., heroin and opium).
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