Somatropin vs Ibutamoren
Head-to-head comparison of Somatropin (Recombinant human growth hormone (rhGH)) and Ibutamoren (Ibutamoren mesylate (MK-677)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Somatropin | Ibutamoren |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Full Name | Recombinant human growth hormone (rhGH) | Ibutamoren mesylate (MK-677) |
| Molecular Weight | 22125 Da | N/A |
| Half-Life | 2-4 hours | about 24 hours |
| Amino Acids | 191 | N/A |
| Typical Dose | 0.004-0.03 mg/kg/day | 10-25 mg/day |
| Route | Subcutaneous | Oral |
| Purity | ≥98% | ≥98% |
| Studies Count | 2000 | 180 |
| Research Status | Clinical/Approved | Clinical |
Somatropin Benefits
- ✓linear growth support
- ✓lean mass preservation
- ✓bone mineral accrual
- ✓IGF-1 elevation
Ibutamoren Benefits
- ✓raises GH/IGF-1
- ✓increases appetite
- ✓supports lean mass retention
- ✓oral non-peptide secretagogue
Somatropin Dosing
daily subcutaneous dosing|titrate to IGF-1 and response|weight-based replacement protocols
Ibutamoren Dosing
10-25 mg orally once daily|take consistently at the same time each day|monitor fasting glucose and edema in longer studies
Somatropin Side Effects
- ⚠edema
- ⚠arthralgia
- ⚠insulin resistance
Ibutamoren Side Effects
- ⚠increased appetite
- ⚠water retention/edema
- ⚠somnolence or lethargy
Research Overview
Somatropin
Somatropin is the best-studied growth hormone peptide, with decades of clinical use in pediatric and adult GH deficiency. Trials consistently show increases in IGF-1 and growth velocity, with adverse effects mainly reflecting excessive GH exposure.
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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