Compare · Head-to-head
Follistatin vs MGF E-domain.
Evidence, risk, regulatory flags, cost, and vendor coverage compared side by side. We don’t sell peptides — we help you choose between them.
Which should you research first?
Start with MGF E-domain, then use the table to confirm fit.
MGF E-domain is the cleaner first read based on the current evidence, risk, and regulatory data stored for this pair. The right answer can still change if your goal, sport testing status, vendor constraints, or monitoring tolerance makes the other option a better fit.
Comparison next step
Personalize this head-to-head.
Take the quiz before converting a comparison into a compound, vendor, or protocol decision.
01 · At a glance
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Primary fit | muscle growth & strength research where you want a clear starting point | muscle growth & strength and tissue repair & recovery comparisons |
| Evidence | Tier C-D | Tier C |
| Risk | extreme | extreme |
| Experience level | advanced | advanced |
| Budget tier | premium | mid |
| Administration route | subcutaneous | subcutaneous |
02 · Use case & timing
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Goal fit | Muscle Growth & Strength | Muscle Growth & Strength, Tissue Repair & Recovery |
| What users compare it for | Myostatin inhibition / muscle growth narrative. Legitimate modality is gene therapy, not RUO peptide. | Muscle repair signaling in preclinical models. |
| Onset timeline | Gene therapy effects measured over months. Consumer peptide timelines are speculative. | Preclinical outcomes vary by model. |
| Main tradeoff | Potential upside comes with much more safety and screening caution than lower-risk alternatives. | Potential upside comes with much more safety and screening caution than lower-risk alternatives. |
03 · Safety & restrictions
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Adverse effects | Systemic muscle-growth modulation carries theoretical off-target risks; extreme risk. | Limited data; growth-factor class concerns apply. |
| Contraindications | No consumer-grade data. | No human data. |
| Interaction notes | Unknown; likely interacts with anabolic pathways and endocrine status. | Unknown. |
| Regulatory status | Not approved | Not approved |
| FDA flag | FDA status unclear | FDA status unclear |
| WADA status | Status unclear | WADA S2 |
04 · Age & monitoring
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Supported age ranges | No age guidance yet | No age guidance yet |
| Life-stage note | Not yet documented | Not yet documented |
| Monitoring burden | Not specified | Not specified |
| Follow-up cadence | Not yet documented | Not yet documented |
05 · Cost & sourcing
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Typical cycle cost | No reliable estimate yet | No reliable estimate yet |
| Estimated monthly cost | No reliable estimate yet | No reliable estimate yet |
| Cost confidence | No estimate | No estimate |
06 · Before you buy
| Decision factor | Follistatin | MGF E-domain |
|---|---|---|
| Tracked vendor listings | 0 listings | 0 listings |
| Sourcing note | No tracked product page yet, so sourcing takes more manual review. | No tracked product page yet, so sourcing takes more manual review. |
| Stack-friendly? | Usually stack-friendly | Usually stack-friendly |
Sources and review notes
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks - U.S. Food and Drug Administration - accessed 2026-05-15
Used for FDA compounding-risk context and peptide safety flags.
- The Prohibited List - World Anti-Doping Agency - accessed 2026-05-15
Used for athlete-facing WADA risk and peptide-class restrictions.
- Peptide therapeutics: current status and future directions - PubMed / Nature Reviews Drug Discovery - accessed 2026-05-15
Used for broad peptide-therapeutics background and evidence framing.
Still deciding
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