Sequence
344 amino acids (protein)
Origin
Recombinant human follistatin
Research Dose
Research protocols typically use 100mcg-1mg subcutaneous. Due to its large size and cost, careful dosing is important. Short cycling protocols are common.
Category
Muscle Growth
How It Works
Follistatin-344 is a recombinant form of human follistatin, a glycoprotein that binds and neutralizes myostatin — the protein that limits muscle growth. By inhibiting myostatin and activin signaling, follistatin removes the natural brake on muscle hypertrophy. It has been extensively studied in gene therapy trials for muscular dystrophy and muscle wasting conditions.
Key Benefits
Inhibits myostatin (muscle growth limiter)
May support muscle growth beyond natural limits
Studied for muscle wasting conditions
Potential fertility applications
Research Highlights
Binds and neutralizes myostatin (muscle growth inhibitor)
Gene therapy trials for Becker muscular dystrophy showed muscle improvements
Animal studies showed dramatic muscle hypertrophy
Also inhibits activin, affecting FSH and reproductive function
Multiple isoforms exist (315, 344, 288) with different tissue distributions
Available Forms
- Lyophilized powder for injection
Legal Status
Follistatin-344 is available for research purposes. Not FDA-approved. It is on WADA's prohibited list for athletes. Not a controlled substance.
Research & Education Only — The information on this page is for research and educational purposes only. It does not constitute medical advice. Consult a qualified healthcare professional before making any decisions.