Follistatin 344
Follistatin 344 is a naturally occurring glycoprotein that acts as a potent inhibitor of myostatin, the protein that limits muscle growth. By binding and neutralizing myostatin, Follistatin 344 removes the biological brake on muscle development, allowing for greater hypertrophy. It also plays roles in reproductive physiology and inflammation modulation.
Frequency
Once daily for 20 days
Cycle Length
20-day cycle, 3x annually
Route
Intramuscular
Research Level
Emerging
Goals
Dosing Protocol
200 mcg per injection (20 units). With standard reconstitution (1 mg in 1 mL), 0.01 mg per unit — 200 mcg = 20 units on a U-100 insulin syringe. Run a 4-bottle cycle over 20 days.
Reconstitution
Add 1 mL bacteriostatic water to a 1 mg vial.
Timing
Morning injection.
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Potential Side Effects
- Limited human data
- Potential off-target effects on reproductive hormones
- Joint discomfort
Important Warnings
- May affect reproductive hormone levels (FSH)
- WADA-prohibited substance
- Very limited human dosing data
Works Well With
Research References
- Rodino-Klapac LR, et al. Mol Ther. 2009;17(6):1067-1075. doi:10.1038/mt.2009.33
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Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. Follistatin 344 may be regulated differently in various jurisdictions. Always consult with a qualified healthcare provider before beginning any peptide protocol. PepStack Pro does not sell peptides or provide medical advice. Content reviewed by Dr. Seth Miller, MD.