Nociceptin vs Leu-enkephalin
Head-to-head comparison of Nociceptin (Nociceptin/orphanin FQ) and Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Nociceptin | Leu-enkephalin |
|---|---|---|
| Category | Pain Management | Pain Management |
| Full Name | Nociceptin/orphanin FQ | Tyr-Gly-Gly-Phe-Leu |
| Molecular Weight | 1881.1 Da | 555.63 Da |
| Half-Life | ~minutes | 1-5 minutes in plasma |
| Amino Acids | 17 | 5 |
| Typical Dose | no approved human dose|research-only | 0.1-5 ug per animal |
| Route | intrathecal|intranasal | Intrathecal / intracerebroventricular |
| Purity | ≥98% | ≥98% |
| Studies Count | 44 | 1000 |
| Research Status | Pre-clinical | Pre-clinical |
Nociceptin Benefits
- ✓allodynia reduction
- ✓central pain modulation
- ✓neuropathic pain research
Leu-enkephalin Benefits
- ✓delta-opioid activity
- ✓endogenous analgesic model
- ✓receptor-selective pharmacology
- ✓nociception pathway research
Nociceptin Dosing
no established human dose|research-only dosing varies
Leu-enkephalin Dosing
Intrathecal 0.1-5 ug per animal|Intracerebroventricular 0.1-2 ug per animal|In vitro 1-100 nM
Nociceptin Side Effects
- ⚠sedation
- ⚠dysphoria
Leu-enkephalin Side Effects
- ⚠sedation
- ⚠constipation-like opioid effects
- ⚠very short plasma stability
Research Overview
Nociceptin
Nociceptin is a major pain-pathway peptide in the spinal cord, brainstem, and trigeminal system. Its relevance to migraine and neuropathic pain is mainly preclinical, where receptor-selective tools are being explored.
Leu-enkephalin
Leu-enkephalin is a standard tool in opioid receptor and pain-transmission research because it helps distinguish delta- from mu-preferring signaling. Its research value is high, but its clinical utility is limited by rapid enzymatic breakdown and delivery challenges.
Ready to buy?
Find both peptides from our verified, lab-tested vendors with purity certificates and third-party testing.