Back to DatabaseNot FDA Approved
Follistatin 344
Also known as: FST344, Follistatin-344
Muscle & Recovery
Phase I
Follistatin 344 is a naturally occurring glycoprotein that acts as a powerful antagonist of myostatin (GDF-8) — the primary negative regulator of muscle growth. By blocking myostatin and activin signaling, Follistatin dramatically increases muscle fiber size and number. Its effects are among the most potent for muscle growth in preclinical models.
Regulatory & Approval Status
While AAV-based gene therapy versions have reached Phase 1 clinical trials for muscular dystrophy, the recombinant peptide form is not FDA-approved and is sold only as a research chemical.
Information compiled from FDA compounding guidance and public regulatory sources. For research and educational purposes only; not medical advice.