Met-enkephalin vs Insulin Lispro
Head-to-head comparison of Met-enkephalin (Tyr-Gly-Gly-Phe-Met) and Insulin Lispro (Insulin lispro (B28-Lys, B29-Pro human insulin analog)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Met-enkephalin | Insulin Lispro |
|---|---|---|
| Category | Pain Management | Diabetes & Metabolic |
| Full Name | Tyr-Gly-Gly-Phe-Met | Insulin lispro (B28-Lys, B29-Pro human insulin analog) |
| Molecular Weight | 573.67 Da | 5808.0 Da |
| Half-Life | 1-5 minutes in plasma | About 1 hour |
| Amino Acids | 5 | 51 |
| Typical Dose | 0.1-5 ug per animal | 0.05-0.2 U/kg per meal |
| Route | Intrathecal / intracerebroventricular | Subcutaneous |
| Purity | ≥98% | ≥98% |
| Studies Count | 1200 | 12000 |
| Research Status | Pre-clinical | Approved |
Met-enkephalin Benefits
- ✓endogenous opioid signaling
- ✓analgesic reference ligand
- ✓spinal antinociception
- ✓neurochemical pain-pathway probe
Insulin Lispro Benefits
- ✓Rapid postprandial glucose control
- ✓Flexible premeal timing
- ✓Predictable onset of action
- ✓Useful in basal-bolus regimens
Met-enkephalin Dosing
Intrathecal 0.1-5 ug per animal|Intracerebroventricular 0.1-2 ug per animal|In vitro 1-100 nM
Insulin Lispro Dosing
Inject SC 0-15 minutes before meals|Adjust dose to carbohydrate intake and premeal glucose|Often paired with a basal insulin
Met-enkephalin Side Effects
- ⚠sedation at higher exposure
- ⚠constipation-like opioid effects
- ⚠rapid enzymatic degradation
Insulin Lispro Side Effects
- ⚠Hypoglycemia
- ⚠Weight gain
- ⚠Injection-site reactions
Research Overview
Met-enkephalin
Met-enkephalin has been extensively used in receptor pharmacology and nociception studies to map mu and delta opioid biology. The main limitation in translational work is very short half-life from peptidase cleavage and poor systemic stability.
Insulin Lispro
Clinical studies show faster onset and shorter duration than regular insulin, improving post-meal glucose control. It is a standard comparator in diabetes pharmacology and closed-loop insulin-delivery research.
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