Peptide Knowledge Base · Recovery
Follistatin-344: what it is, what the evidence says, and its real status
A myostatin-inhibiting protein that can drive extreme muscle growth, high-risk, WADA-banned, research-only.
Short version: 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: Education only.
Regulatory status: Research-only · WADA-banned · Education only.
Not offered, high-risk, education only. Follistatin-344 inhibits myostatin to drive uncontrolled muscle growth; it is research-only, WADA-banned, and not FDA-approved. We provide caution-first education only.
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, and it is not available.
How honest is the evidence?
Evidence grade D — research-only; uncontrolled-growth risk; minimal human safety data. 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).
How it is taken
Not offered; education only.
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 or the knowledge base.
Last reviewed 2026-08-11 · Peptós.LIFE · Not medical advice.