Performance & GH axis
Follistatin 344
Myostatin Inhibitor
A naturally occurring protein that blocks myostatin — the hormone that limits muscle growth. By suppressing this brake on muscle development, it may allow greater muscle growth potential.
Also known as: FST-344, Follistatin-344
- Status
- Follistatin 344 is a research compound and not approved by the FDA for human use.
- Evidence
- Preclinical. Evidence comes from animal or lab studies; effects in people are not established.
- Half-life
- Variable — depends on formulation
- How it's taken
- Subcutaneous injection
- Mechanism
- Anabolic (IGF-1 / myostatin)
- Pathways
- Myostatin
How Follistatin 344 works
Binds directly to myostatin and other TGF-beta family members, neutralizing them. Since myostatin acts as a natural limit on how much muscle your body builds, blocking it theoretically removes that ceiling.
What research has looked at
- Myostatin suppression for muscle growth
- May enhance exercise-induced muscle gains
- Supports muscle preservation
- Also regulates reproductive hormones
Evidence level: Preclinical. Evidence comes from animal or lab studies; effects in people are not established. These are areas studied or reported, not promised effects.
Reported side effects and risks
- Very limited human safety data
- Potential for unpredictable muscle growth
- May affect reproductive hormones (FSH)
- Unknown long-term effects
- Quality concerns with available products
Sources
- PubMed research on follistatin myostatin inhibition muscle · NIH · National Library of Medicine
- Active clinical trials for follistatin gene therapy · U.S. National Library of Medicine
- DrugBank record for follistatin · DrugBank
Track Follistatin 344 in Peptide Vault
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Follistatin 344 FAQ
What is Follistatin 344?
A naturally occurring protein that blocks myostatin — the hormone that limits muscle growth. By suppressing this brake on muscle development, it may allow greater muscle growth potential.
How does Follistatin 344 work?
Binds directly to myostatin and other TGF-beta family members, neutralizing them. Since myostatin acts as a natural limit on how much muscle your body builds, blocking it theoretically removes that ceiling.
Is Follistatin 344 FDA approved?
No. Follistatin 344 is a research compound and not approved by the FDA for human use. Evidence level: preclinical. Evidence comes from animal or lab studies; effects in people are not established.
What is the half-life of Follistatin 344?
Reported half-life: Variable — depends on formulation.
How is Follistatin 344 taken?
Subcutaneous injection.
What side effects have been reported with Follistatin 344?
Reported in the sources: Very limited human safety data; Potential for unpredictable muscle growth; May affect reproductive hormones (FSH); Unknown long-term effects; Quality concerns with available products.
Educational summary compiled from the sources listed above. Not medical advice. Peptide Vault does not sell, source or recommend any compound. Talk to a qualified clinician before starting or changing anything.