Darbepoetin Alfa vs FS315
Head-to-head comparison of Darbepoetin Alfa (Darbepoetin alfa, recombinant human erythropoiesis-stimulating protein) and FS315 (Follistatin-315 (FS315)) — benefits, dosing, side effects, research data, and where to buy.
Research Score
| Property | Darbepoetin Alfa | FS315 |
|---|---|---|
| Category | Muscle & Performance | Muscle & Performance |
| Full Name | Darbepoetin alfa, recombinant human erythropoiesis-stimulating protein | Follistatin-315 (FS315) |
| Molecular Weight | ≈37,000 Da | ~40 kDa |
| Half-Life | ~21 h IV; ~49 h SC | N/A; depends on construct/delivery |
| Amino Acids | 165 | 315 |
| Typical Dose | 0.45 mcg/kg weekly SC or 0.75 mcg/kg every 2 weeks | Research-only; no standardized human dose |
| Route | Subcutaneous/IV | Intramuscular / research expression systems |
| Purity | ≥98% | ≥98% |
| Studies Count | 210 | 95 |
| Research Status | Clinical | Pre-clinical |
Darbepoetin Alfa Benefits
- ✓longer-acting erythropoiesis
- ✓stable hemoglobin
- ✓increased oxygen delivery
- ✓may improve aerobic capacity
FS315 Benefits
- ✓activin neutralization
- ✓muscle growth signaling
- ✓anti-catabolic support
- ✓tissue repair modulation
Darbepoetin Alfa Dosing
0.45 mcg/kg weekly SC|0.75 mcg/kg every 2 weeks SC|Dose-adjust to hemoglobin response
FS315 Dosing
Research-only recombinant/protein-expression studies|no standardized clinical dose|route varies by platform
Darbepoetin Alfa Side Effects
- ⚠hypertension
- ⚠thromboembolism
- ⚠headache
FS315 Side Effects
- ⚠off-target endocrine effects
- ⚠immune response risk
- ⚠fluid balance changes
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.
FS315
Follistatin-315 is a key reference isoform in studies of muscle anabolism and reproductive/endocrine biology. In muscle research, it is relevant because it suppresses activin and can indirectly blunt myostatin pathway output.
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