Modified GRF(1-29) vs Ibutamoren
Head-to-head comparison of Modified GRF(1-29) ([D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide) and Ibutamoren (Ibutamoren mesylate (MK-677)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Modified GRF(1-29) | Ibutamoren |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Full Name | [D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide | Ibutamoren mesylate (MK-677) |
| Molecular Weight | N/A | N/A |
| Half-Life | 10-30 minutes | about 24 hours |
| Amino Acids | 29 | N/A |
| Typical Dose | 50-300 mcg | 10-25 mg/day |
| Route | Subcutaneous | Oral |
| Purity | ≥98% | ≥98% |
| Studies Count | 150 | 180 |
| Research Status | Investigational | Clinical |
Modified GRF(1-29) Benefits
- ✓enhanced GH release
- ✓greater peptide stability
- ✓IGF-1 support research
- ✓longer receptor engagement
Ibutamoren Benefits
- ✓raises GH/IGF-1
- ✓increases appetite
- ✓supports lean mass retention
- ✓oral non-peptide secretagogue
Modified GRF(1-29) Dosing
50-100 mcg SC for acute GH-response studies|100-300 mcg SC in monitored research protocols|repeat dosing in short investigative cycles with GH/IGF-1 tracking
Ibutamoren Dosing
10-25 mg orally once daily|take consistently at the same time each day|monitor fasting glucose and edema in longer studies
Modified GRF(1-29) Side Effects
- ⚠headache
- ⚠water retention
- ⚠injection-site irritation
Ibutamoren Side Effects
- ⚠increased appetite
- ⚠water retention/edema
- ⚠somnolence or lethargy
Research Overview
Modified GRF(1-29)
Modified GRF(1-29) has been studied as a practical GHRH analog for boosting GH release while improving peptide stability versus the native fragment. It is a standard reference compound in experimental work on growth hormone pulsatility and analog design.
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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