Educational information only. Not medical advice. Talk to a qualified healthcare professional before using any compound. Disclaimer

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Follistatin 344

Growth Hormone & Muscle

Follistatin 344

Also known as FST-344, FS-344

Animal or no human dataNot approvedWADA prohibited

€145

Discussed for: Bigger muscles.

Sequence: not listed. Modified or non-standard residues are left out on purpose.

Effect strengthHow hard it acts on the body5/10
Proof levelHow well that is shown in humans1/10
Risk levelHow much can go wrong8/10

Editorial 1 to 10 estimates from published research, not measured values. How to read these

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01 / Identity

What it is

Follistatin 344 is a protein (344 aa). Main reported uses: bigger muscles. Current status: not approved.

Molecule type
Protein (344 aa)
How it is taken
Injection
Other names
FST-344, FS-344

Route only. This library does not publish doses or protocols.

02 / Mechanism

How it is thought to work

Binds and blocks myostatin, removing a natural limit on muscle growth

Mechanisms seen in cells or animals do not always happen the same way in people.

03 / Potential benefits

What people use it for

Bigger muscles

Animal or no human data

No meaningful human data. Effects and safety in people are unknown, which is not the same as safe.

Listed uses are what people use it for, not proven outcomes.

04 / Known risks

Side effects and risks

Unknown; affects fertility hormones (FSH); products often fake

Risk level 8 of 10

High risk score: serious harms are documented or plausible, and there is little data to rule them out.

Unknown long-term effects count as a risk, not as a clean record.

05 / Regulatory

Regulatory status

Status
Not approved
Details
Not approved
Sport (WADA)
Yes: S4 (myostatin inhibitors)

Status reflects information up to mid-2026 and changes over time. Check current sources.

06 / Evidence quality

How good is the evidence?

Animal / gene-therapy only

How we grade evidence

07 / Notes and sources

Notes and sources

  • Growth-factor peptides carry a theoretical risk of feeding existing cancers.
  • Animal only means effects and safety in humans are unknown, not that they are proven safe.
  • Products sold online as research peptides are unregulated. Tests of such products often find wrong amounts, impurities or a different compound.
  • Anyone using compounds like this regularly should have medical supervision and bloodwork (for example IGF-1, glucose and HbA1c, hormones, lipids).
  • Source: Peptide Reference Table, an editorial review of published research up to mid-2026. Scores are 1 to 10 editorial estimates, not measured values. Regulatory and WADA status change over time.

Educational information only. Not medical advice. Talk to a qualified healthcare professional before using any compound.

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