Follistatin-344

A natural myostatin- and activin-binding protein; the only human data come from small gene-therapy trials, not from injecting the protein.

Also known as: FS344, FST344, Follistatin
Area: Hormones
Status: Not approved anywhere; human data come only from small gene-therapy trials

Articles on Follistatin-344

HormonesHuman study

Follistatin-344: the human trials used gene therapy, not an injected peptide

Every human study of follistatin-344 delivered the gene by viral vector into muscle, in a handful of patients. The protein sold in vials has no human data behind it.

HPR Editorial · 19 Sept 2026 · 7 min read