MK-677 vs Desmopressin
Head-to-head comparison of MK-677 (Ibutamoren Mesylate (MK-677)) and Desmopressin (1-Deamino-8-D-arginine vasopressin) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | MK-677 | Desmopressin |
|---|---|---|
| Category | Growth Hormone | Cognitive Enhancement |
| Full Name | Ibutamoren Mesylate (MK-677) | 1-Deamino-8-D-arginine vasopressin |
| Molecular Weight | 528.662 g/mol | 1069.22 Da |
| Half-Life | ~24 hours | 1.5-3 hours |
| Amino Acids | Non-peptide compound | 9 |
| Typical Dose | — | 10-40 mcg intranasal |
| Route | — | Intranasal/Oral |
| Purity | >99% | ≥98% |
| Studies Count | 120 | 35 |
| Research Status | Active Research | Clinical |
MK-677 Benefits
- ✓Oral GH secretagogue, 24-hour GH elevation, increases IGF-1, improves sleep quality, increases lean mass, does not suppress natural GH
Desmopressin Benefits
- ✓memory consolidation
- ✓reduced pressor burden
- ✓recall support
- ✓short-term learning
MK-677 Dosing
10-25 mg orally once daily before bedtime. 25 mg is the most studied dose. Can be used long-term without cycling.
Desmopressin Dosing
intranasal research dosing|10-40 mcg or IU-equivalent studies|single-dose protocols
MK-677 Side Effects
- ⚠Increased appetite, mild water retention, drowsiness, transient numbness, mild increase in fasting blood glucose with long-term use.
Desmopressin Side Effects
- ⚠hyponatremia
- ⚠headache
- ⚠nasal irritation
Research Overview
MK-677
A landmark 2-year study in elderly adults demonstrated significant increases in lean mass, GH pulsatility, and IGF-1 to youthful ranges. Selectively agonizes GHS-R1a without increasing cortisol or prolactin.
Desmopressin
The literature is mixed, but desmopressin has shown memory-related effects in selected populations and experimental paradigms. Its cognitive effects are usually discussed as a vasopressin-pathway probe rather than a primary nootropic.
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