Is Follistatin 344 legal?
Follistatin 344 is not FDA approved as a finished drug. For drug-tested athletes it is WADA banned (S4). Not prescribed in conventional medicine.. Legal status depends on your country and changes over time. This reflects US status at the time of writing and is not legal or medical advice.
Regulatory status
- FDA: Not FDA approved.
- WADA: Banned (S4)
- Prescription: Not prescribed in conventional medicine.
References
- Long-term enhancement of skeletal muscle mass and strength by single gene administration of myostatin inhibitors — Haidet AM, Rizo L, Handy C, et al. (incl. Mendell JR, Kaspar BK), PNAS, 2008
- Follistatin gene delivery enhances muscle growth and strength in nonhuman primates — Kota J, Handy C, Haidet AM, et al. (incl. Kaspar BK), Science Translational Medicine, 2009
- A phase 1/2a follistatin gene therapy trial for Becker muscular dystrophy — Mendell JR, et al., Molecular Therapy, 2015 (NCT01519349)
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.