Growth hormone / secretagogues
Follistatin-344
Preclinical (animal)FS-344 · Myostatin-binding protein
Myostatin inhibitor studied for muscle growth.
What it is
A form of the natural protein follistatin that binds and neutralizes myostatin, a negative regulator of muscle mass.
How it works
Sequesters myostatin (and related TGF-β ligands), releasing the brake on muscle growth.
Studied for
Muscle growth, muscular dystrophy (preclinical/gene-therapy research).
Regulatory status
Not FDA-approved; research chemical; WADA-prohibited.
Safety
No established human safety data; systemic TGF-β pathway effects are a theoretical concern.
Educational information only — not medical advice, and not a recommendation to use any compound. Many peptides here are not approved for human use; legal status and evidence quality vary and are noted above. This page contains no dosing information. Consult a qualified clinician before making any health decision.