Leu-enkephalin vs Insulin Lispro
Head-to-head comparison of Leu-enkephalin (Tyr-Gly-Gly-Phe-Leu) 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 | Leu-enkephalin | Insulin Lispro |
|---|---|---|
| Category | Pain Management | Diabetes & Metabolic |
| Full Name | Tyr-Gly-Gly-Phe-Leu | Insulin lispro (B28-Lys, B29-Pro human insulin analog) |
| Molecular Weight | 555.63 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 | 1000 | 12000 |
| Research Status | Pre-clinical | Approved |
Leu-enkephalin Benefits
- ✓delta-opioid activity
- ✓endogenous analgesic model
- ✓receptor-selective pharmacology
- ✓nociception pathway research
Insulin Lispro Benefits
- ✓Rapid postprandial glucose control
- ✓Flexible premeal timing
- ✓Predictable onset of action
- ✓Useful in basal-bolus regimens
Leu-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
Leu-enkephalin Side Effects
- ⚠sedation
- ⚠constipation-like opioid effects
- ⚠very short plasma stability
Insulin Lispro Side Effects
- ⚠Hypoglycemia
- ⚠Weight gain
- ⚠Injection-site reactions
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.
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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