hGHRH(1-37)OH vs Ibutamoren
Head-to-head comparison of hGHRH(1-37)OH (Human growth hormone-releasing factor (1-37) hydroxyl) and Ibutamoren (Ibutamoren mesylate (MK-677)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | hGHRH(1-37)OH | Ibutamoren |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Full Name | Human growth hormone-releasing factor (1-37) hydroxyl | Ibutamoren mesylate (MK-677) |
| Molecular Weight | N/A | N/A |
| Half-Life | 5-20 minutes | about 24 hours |
| Amino Acids | 37 | N/A |
| Typical Dose | 1-2 mcg/kg | 10-25 mg/day |
| Route | Subcutaneous/IV | Oral |
| Purity | ≥98% | ≥98% |
| Studies Count | 60 | 180 |
| Research Status | Clinical Research | Clinical |
hGHRH(1-37)OH Benefits
- ✓GH release studies
- ✓minimal-sequence mapping
- ✓receptor pharmacology
- ✓peptide stability research
Ibutamoren Benefits
- ✓raises GH/IGF-1
- ✓increases appetite
- ✓supports lean mass retention
- ✓oral non-peptide secretagogue
hGHRH(1-37)OH Dosing
1-2 mcg/kg SC or IV bolus|acute stimulation with serial GH assays|short-course research administration with biomarker monitoring
Ibutamoren Dosing
10-25 mg orally once daily|take consistently at the same time each day|monitor fasting glucose and edema in longer studies
hGHRH(1-37)OH Side Effects
- ⚠flushing
- ⚠headache
- ⚠transient fatigue
Ibutamoren Side Effects
- ⚠increased appetite
- ⚠water retention/edema
- ⚠somnolence or lethargy
Research Overview
hGHRH(1-37)OH
Human GHRF(1-37)OH has appeared in studies examining how loss of C-terminal residues affects biological activity at the GHRH receptor. It is often used alongside other fragments to define structure-activity relationships within the GHRH family.
Ibutamoren
Clinical studies show oral ibutamoren reliably elevates GH and IGF-1 over 24 hours with once-daily dosing. Body composition and appetite effects vary by population, and development has been limited by metabolic side effects.
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