Verified Peptide ReviewLast reviewed: 5 March 2026
Compound Profile · Recovery
Follistatin 344
Follistatin 344 is a synthetic peptide that inhibits myostatin and other members of the transforming growth factor-beta family, studied for anabolic muscle effects.
LegalResearch onlyEvidenceEmergingHuman useNot approved
6.4/ 10
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Quick verdict
Interesting mechanistic target but limited human evidence. Gene therapy approaches have been investigated; peptide use is largely in research.
Reality check
What this isn't
- Not approved for human use — research-only context
- No regulator has approved human use
- Evidence base is early — long-term data limited
- Side-effect profile not fully characterised
- Educational only — not medical advice
Full Follistatin 344 review
A 344-amino-acid peptide that antagonises myostatin and activin A, members of the TGF-beta superfamily.
Myostatin is a negative regulator of muscle growth; follistatin blocks it, allowing greater muscle protein synthesis.
Looking at alternatives?
Compounds with comparable research interest but different evidence, regulatory status, or risk profile.