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Growth Factor

Follistatin 344

Also known as: FST-344, Follistatin

preclinical onlyWADA bannedNot FDA approvedResearch only
Mechanism of Action

Follistatin 344 is a catalog-expanded peptide entry in ProtoComp's source-backed compound corpus. It is included for search, calculator math, stack awareness, and future research curation based on expand compound catalog, local_seed. Published dosing, cycle length, and clinical-use claims are intentionally left null until compound-specific evidence is reviewed.

Published Dose Range
Low100 mcg/dose
Typical100-200 mcg every other day
High300 mcg/dose

No published human trials. Dosing is extrapolated from animal data and anecdotal use.

Published Cycle Range

No published cycle data available.

Administration
Routessubcutaneous, intramuscular
FrequencyEvery other day

Limited to no published timing guidance.

Safety Profile

Contraindications

  • Cancer history
  • Any condition requiring myostatin regulation

Common side effects

  • Injection site reactions
  • Unknown — very limited human data

Serious risks

  • Myostatin inhibition long-term effects unknown
  • Potential cardiac/tendon structural concerns (theoretical)

Requires monitoring

  • CK
  • Cardiac function if used long-term

Pregnancy / breastfeeding

No data — consult clinician

Common Misconceptions
  • Not a shortcut to myostatin-knockout physique — human response is far smaller than animal data suggests
Next Steps

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Reference information only. Always confirm with your clinician before changing your protocol.