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Peptide Insights provides information about peptides based on published scientific research and clinical literature. This content is designed to help you understand the science, not to guide personal medical decisions.
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FST-344 · Follistatin
A myostatin inhibitor that dramatically increases muscle growth potential
Typical Dose
100 mcg per day
Route
Intramuscular
Frequency
Once daily
Cycle
10–30 days (short cycles recommended)
Follistatin-344 is a naturally occurring glycoprotein that acts as a potent inhibitor of myostatin, the protein that limits muscle growth. By blocking myostatin, Follistatin-344 can dramatically increase muscle mass and strength. It is one of the most discussed peptides in the performance enhancement community due to its remarkable muscle-building potential.
Follistatin-344 binds to and neutralizes myostatin (GDF-8), a TGF-beta family member that inhibits muscle cell growth and differentiation. By blocking myostatin, Follistatin allows muscle satellite cells to proliferate and differentiate without restriction. It also inhibits activin, another muscle growth inhibitor, providing a dual mechanism for enhanced muscle development.
Typical Dose
100 mcg per day
Dose Range
50–200 mcg per day
Frequency
Once daily
Route
Intramuscular injection (into target muscle)
Cycle Length
10–30 days (short cycles recommended)
CLINICAL NOTES
Intramuscular injection into the target muscle is the standard protocol. Short cycles (10–30 days) are recommended due to the potency and limited long-term safety data. The muscle-building effects can be dramatic and relatively permanent. Extremely limited human safety data available.
IMPORTANT DISCLAIMER
This information is for educational purposes only. Always consult a qualified healthcare provider before starting any peptide protocol. Individual responses vary and medical supervision is recommended.
Follistatin-344 inhibits myostatin for muscle growth. It pairs well with anabolic and recovery peptides.
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