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Not FDA approved and sold as a research chemical. This page is educational information only. It is not medical advice and not a recommendation to use anything.
IndexedBuilt automatically from public databases on 2026-09-30. Not yet hand-reviewed by PLOBT.How this works →

Follistatin 344

Not FDA approved

Myostatin-binding glycoprotein isoform

Also known as: FST-344

Evidence score
14/ 100
Thin evidence

Very thin human evidence

  • Regulatory standing. Sold as a research chemical, not approved
  • Animal / preclinical only. Evidence is largely animal or in-vitro
  • No registered human trials. Nothing registered on ClinicalTrials.gov
  • No sources. Nothing cited to verify

Computed with the same four public criteria as every profile. The human-evidence grade on an indexed profile is set automatically and may change when it is hand-reviewed. It is not a safety score, not a purity rating, and not medical advice, and not a claim that this compound treats, cures, or prevents any condition.

What it is

Follistatin 344 is a form of follistatin, a naturally occurring protein that binds and neutralizes members of the TGF-beta family such as myostatin and activin. By blocking myostatin, which normally limits muscle growth, it is thought to promote muscle growth. FST-344 is a precursor isoform that is processed into the circulating FS-315 form and has mainly been studied as a gene therapy construct.

What the evidence shows

Automatic summaryAnimal / preclinical

There are no registered human trials of Follistatin 344 as a peptide product, and it is not FDA-approved. The published literature is small and consists mostly of animal and gene therapy research. Effects on muscle in healthy people have not been established.

Registered human trials

Live from ClinicalTrials.gov, refreshed daily.

0registered studies
Nonemost advanced phase
0completed (sample)
0recruiting (sample)

Published literature

Live from Europe PMC. This is how much has been published, not how much is proven in humans.

7papers referencing Follistatin 344

The transgenic expression of human follistatin-344 increases skeletal muscle mass in pigs.

Transgenic Res2017

Detection of black market follistatin 344.

Drug Test Anal2019

Safety and Efficacy of Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance.

Sports Med2026

Central serous chorioretinopathy associated with high-dose follistatin-344: a retrospective case series.

Int Ophthalmol2020

Sources

Risks, side effects and study doses are only published on hand-reviewed profiles. Want this one reviewed, or spotted something wrong? Tell us.