Decades of research confirm acupuncture releases endogenous opioid peptides (endorphins, enkephalins, dynorphins) with frequency-specific patterns, providing the definitive scientific mechanism for acupuncture's pain relief.
Key findingAcupuncture and electroacupuncture produce analgesia through frequency-specific release of endogenous opioid peptides: low frequency releases endorphi
What the researchers found
Acupuncture and electroacupuncture produce analgesia through frequency-specific release of endogenous opioid peptides: low frequency releases endorphins/enkephalins (mu/delta) and high frequency releases dynorphins (kappa), confirmed across animal and human studies.
Why it matters
Advances understanding of opioid-peptides, pain, receptor-signaling with translational implications.
How the study worked
review study examining opioid-peptides and pain.
What this study cannot tell us
Study-specific limitations apply; see abstract for details.
How to read the evidence
moderate evidence from review study design.
When this study was published
Published in 2004.
The bigger picture
Contributes to the growing body of peptide research with implications for clinical development and therapeutic applications.
Questions still open
- Further research needed to confirm and extend these findings.
- Clinical translation and safety need evaluation.
- Optimal dosing and delivery require characterization.
Common questions
What was the main focus of this study?
What was discovered?
Read the original research
Acupuncture and endorphins.
Neuroscience letters, 361(1-3), 258-61
Citation
Han, Ji-Sheng. (2004). Acupuncture and endorphins.. Neuroscience letters, 361(1-3), 258-61.