Met-enkephalin, also known as metenkefalin (INN), sometimes referred to as opioid growth factor (OGF), is a naturally occurring, endogenous opioid peptide that has opioid effects of a relatively short duration.
A naturally produced opioid peptide called met-enkephalin, also known as metenkefalin or opioid growth factor, has a brief impact due to its inherent properties.