Leu-enkephalin vs Calcitonin
Head-to-head comparison of Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) and Calcitonin (Salmon Calcitonin) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Leu-enkephalin | Calcitonin |
|---|---|---|
| Category | Pain Management | Pain Management |
| Full Name | Tyr-Gly-Gly-Phe-Leu | Salmon Calcitonin |
| Molecular Weight | 555.63 Da | 3431.9 Da |
| Half-Life | 1-5 minutes in plasma | about 10-15 minutes |
| Amino Acids | 5 | 32 |
| Typical Dose | 0.1-5 ug per animal | 100 IU/day SC or 200 IU/day intranasal |
| Route | Intrathecal / intracerebroventricular | Intranasal/Subcutaneous |
| Purity | ≥98% | ≥98% |
| Studies Count | 1000 | 350 |
| Research Status | Pre-clinical | Approved |
Leu-enkephalin Benefits
- ✓delta-opioid activity
- ✓endogenous analgesic model
- ✓receptor-selective pharmacology
- ✓nociception pathway research
Calcitonin Benefits
- ✓bone pain relief
- ✓short-term analgesic effect
- ✓may reduce opioid requirement
- ✓useful in osteoporotic fracture pain
Leu-enkephalin Dosing
Intrathecal 0.1-5 ug per animal|Intracerebroventricular 0.1-2 ug per animal|In vitro 1-100 nM
Calcitonin Dosing
100 IU subcutaneous daily|200 IU intranasal daily|short-term use in acute pain settings
Leu-enkephalin Side Effects
- ⚠sedation
- ⚠constipation-like opioid effects
- ⚠very short plasma stability
Calcitonin Side Effects
- ⚠nausea
- ⚠flushing
- ⚠rhinitis
Research Overview
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.
Calcitonin
Calcitonin has been evaluated in randomized trials and reviews for pain associated with vertebral compression fractures and other bone-related conditions. The signal is strongest for short-term analgesia rather than long-term chronic pain control.
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