Peptide Knowledge Base · Recovery

Follistatin-344: what it is, what the evidence says, and its real status

A myostatin blocker that lets muscle grow without the usual brake. The lack of a brake is the danger. WADA-banned, research-only, education and caution only.

Can you actually get it?

Plain-English verdict: No availability record.

Regulatory status: No regulatory record.

How does Follistatin-344 work?

A protein that binds and inhibits myostatin, removing the body's natural limit on muscle growth.

What it does — and what it does not do

What it does: Produced dramatic muscle growth in animal and gene-therapy models.

What it does not do: It is not approved or safe, removing the growth brake carries real cardiac and tissue risk.

How honest is the evidence?

Evidence grade D — Animal and lab evidence; human trials still to come.

research-only; uncontrolled-growth risk; minimal human safety data

A grade measures how much human evidence exists, not whether a molecule is good, safe, or worth your interest. Read our grading methodology for what each grade means.

What we still don't know: Long-term cardiac, tendon, and tumor risks of myostatin inhibition are uncharacterized in humans.

WADA status: Banned (S4.5).

Who should not take it

Uncontrolled-growth risk; WADA-banned; not characterized for safe human use.

Sources

Follistatin / myostatin-inhibition literature; WADA Prohibited List

Compounded medications are not FDA-approved. We keep two signals separate and never collapse them: whether you can get something, and what the rule currently says. See the live FDA Peptide Tracker for status.

Join the founding list →

Embed this card on your site · free, CC BY 4.0, no key.

Last reviewed Jun 18, 2026 · Peptós.LIFE · Not medical advice.