Peptide data sheet
Follistatin 344
Performance · FS-344 · Follistatin-344 · FST-344
Verdict
unprovenfor muscle growth in humans
Quick answer
Follistatin 344 is one natural isoform of the follistatin protein, commonly researched for its ability to bind and neutralize myostatin, a signal that limits muscle size. In animal models, blocking myostatin was associated with larger muscles, and one small gene-therapy trial explored a related approach in people. Human evidence for the research peptide itself is extremely limited, no validated human protocol exists, and it is not FDA-approved.
- Class
- Follistatin isoform / myostatin-binding protein
- Half-life
- Short in circulation (reported in animal work)
- FDA status
- Not FDA-approved; sold for research use only
- WADA banned?
- Yes
Which form actually works?
Research peptide (injectable-grade)
Unproven
The form sold to consumers. Studied mostly in animals; human data on this form is essentially absent, and purity of gray-market supply is unverified.
AAV gene therapy (AAV1-FS344)
Promising
A distinct clinical-research approach that delivers the follistatin gene, studied in early muscular-dystrophy trials. This is a trial intervention, not the peptide vial sold online.