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Follistatin is a naturally occurring glycoprotein, a protein with sugar groups attached. It binds to members of the TGF-beta family of signaling proteins, including activin and myostatin. Myostatin is a protein that limits muscle growth.
The follistatin gene produces more than one form of the protein. FS-344 is the name of one of these forms, which the body then processes into a shorter circulating version. Products labeled “follistatin-344” are typically recombinant, meaning made in cell culture.
Current status: Not FDA-approved.
Follistatin-344 is not the active ingredient in any FDA-approved medicine, and the FDA has not found it safe and effective for any use in people.
Myostatin-binding proteins such as follistatin are also prohibited in competitive sport under the World Anti-Doping Code.
Peptide Labs does not sell this compound. This page is general information, not medical advice. Our Peptide Guide exists to explain what these compounds are and how they are regulated, not to supply them.
Anyone with questions about follistatin-344 should speak with a licensed healthcare provider, who can explain the current evidence and the legal status in plain terms.
See the full list of compound profiles in the Peptide Guide.
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