Modified GRF(1-29) vs hGHRH(1-40)OH
Head-to-head comparison of Modified GRF(1-29) ([D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide) and hGHRH(1-40)OH (Human growth hormone-releasing factor (1-40) hydroxyl) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Modified GRF(1-29) | hGHRH(1-40)OH |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Full Name | [D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide | Human growth hormone-releasing factor (1-40) hydroxyl |
| Molecular Weight | N/A | N/A |
| Half-Life | 10-30 minutes | 5-20 minutes |
| Amino Acids | 29 | 40 |
| Typical Dose | 50-300 mcg | 1-2 mcg/kg |
| Route | Subcutaneous | Subcutaneous/IV |
| Purity | ≥98% | ≥98% |
| Studies Count | 150 | 85 |
| Research Status | Investigational | Clinical Research |
Modified GRF(1-29) Benefits
- ✓enhanced GH release
- ✓greater peptide stability
- ✓IGF-1 support research
- ✓longer receptor engagement
hGHRH(1-40)OH Benefits
- ✓GH secretion research
- ✓fragment-activity comparison
- ✓receptor binding studies
- ✓axis physiology modeling
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
hGHRH(1-40)OH Dosing
1-2 mcg/kg SC or IV in acute research settings|single-bolus GH stimulation protocols|repeated low-dose administration in comparative studies
Modified GRF(1-29) Side Effects
- ⚠headache
- ⚠water retention
- ⚠injection-site irritation
hGHRH(1-40)OH Side Effects
- ⚠flushing
- ⚠headache
- ⚠lightheadedness
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.
hGHRH(1-40)OH
Human GHRF(1-40)OH has been studied to understand how truncation of the native hormone changes biological potency and half-life. It is a common research tool for mapping minimal active sequences within the GHRH family.
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