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