Darbepoetin Alfa vs ACE-031
Head-to-head comparison of Darbepoetin Alfa (Darbepoetin alfa, recombinant human erythropoiesis-stimulating protein) and ACE-031 (ACE-031 (soluble activin receptor type IIB-Fc)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Darbepoetin Alfa | ACE-031 |
|---|---|---|
| Category | Muscle & Performance | Muscle & Performance |
| Full Name | Darbepoetin alfa, recombinant human erythropoiesis-stimulating protein | ACE-031 (soluble activin receptor type IIB-Fc) |
| Molecular Weight | ≈37,000 Da | ~95 kDa |
| Half-Life | ~21 h IV; ~49 h SC | Days to weeks |
| Amino Acids | 165 | N/A |
| Typical Dose | 0.45 mcg/kg weekly SC or 0.75 mcg/kg every 2 weeks | 0.1-3 mg/kg in early studies |
| Route | Subcutaneous/IV | Subcutaneous |
| Purity | ≥98% | ≥98% |
| Studies Count | 210 | 75 |
| Research Status | Clinical | Clinical |
Darbepoetin Alfa Benefits
- ✓longer-acting erythropoiesis
- ✓stable hemoglobin
- ✓increased oxygen delivery
- ✓may improve aerobic capacity
ACE-031 Benefits
- ✓myostatin/activin neutralization
- ✓lean mass gain
- ✓muscle function support
- ✓anti-catabolic effect
Darbepoetin Alfa Dosing
0.45 mcg/kg weekly SC|0.75 mcg/kg every 2 weeks SC|Dose-adjust to hemoglobin response
ACE-031 Dosing
Clinical studies used single or repeated SC doses|dose escalation in mg/kg|monitoring for edema/bleeding
Darbepoetin Alfa Side Effects
- ⚠hypertension
- ⚠thromboembolism
- ⚠headache
ACE-031 Side Effects
- ⚠telangiectasia/vascular effects
- ⚠epistaxis
- ⚠headache/edema
Research Overview
Darbepoetin Alfa
Clinical studies show durable hemoglobin correction with less frequent dosing than epoetin alfa. The endurance benefit, where present, would come from improved oxygen-carrying capacity rather than a direct ergogenic pathway.
ACE-031
ACE-031 produced increases in lean mass in early studies, but development was curtailed after safety concerns and variable efficacy. Its literature remains important because it validated activin receptor blockade as a muscle-building strategy.
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