Modified GRF(1-29) vs hGHRH(1-44)
Head-to-head comparison of Modified GRF(1-29) ([D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide) and hGHRH(1-44) (Human growth hormone-releasing hormone (1-44) amide) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Modified GRF(1-29) | hGHRH(1-44) |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Full Name | [D-Ala2, Nle27]-human growth hormone-releasing hormone (1-29) amide | Human growth hormone-releasing hormone (1-44) amide |
| Molecular Weight | N/A | N/A |
| Half-Life | 10-30 minutes | 5-15 minutes |
| Amino Acids | 29 | 44 |
| Typical Dose | 50-300 mcg | 0.1-1 mcg/kg |
| Route | Subcutaneous | Subcutaneous/IV |
| Purity | ≥98% | ≥98% |
| Studies Count | 150 | 120 |
| Research Status | Investigational | Clinical Research |
Modified GRF(1-29) Benefits
- ✓enhanced GH release
- ✓greater peptide stability
- ✓IGF-1 support research
- ✓longer receptor engagement
hGHRH(1-44) Benefits
- ✓physiologic GH pulse support
- ✓IGF-1 pathway stimulation
- ✓pituitary receptor mapping
- ✓endocrine research tool
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(1-44) Dosing
0.1-1 mcg/kg SC or IV bolus for stimulation studies|single-dose endocrine challenge with timed GH sampling|pulsatile administration in clamp/infusion experiments
Modified GRF(1-29) Side Effects
- ⚠headache
- ⚠water retention
- ⚠injection-site irritation
hGHRH(1-44) Side Effects
- ⚠flushing
- ⚠headache
- ⚠transient nausea
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(1-44)
Human GHRH(1-44) amide has been used extensively to characterize hypothalamic control of pituitary somatotrophs and the downstream GH/IGF-1 axis. It remains a standard comparator in studies of GHRH agonism, secretion dynamics, and receptor pharmacology.
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