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Myostatin inhibitor
Live data

Follistatin 344

Muscle & performance

A myostatin-inhibiting protein studied in muscle-growth research.

FST-344FollistatinFS-344

Get told when a price moves or a lab test changes.

Observed median price

$186

Δ —
Every observation
DateObserved
$135.56
$185.72
$769.95
$769.95
$769.95
$769.95
$185.72
$185.72
$185.72
$185.72
$185.72
$769.95
$185.72
$769.95
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$185.72
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95
$769.95

Not enough listings with 30 days of checks to summarise a change — 2 of 11 qualify so far.

11

Active listings

0

Independent lab tests

$88–$1,400

Observed price range

4

Known aliases

Understand this compound

What is Follistatin 344?

In clinical trialsa.k.a. FS-344

A protein that blocks myostatin — the body's natural 'stop growing muscle' signal. Studied for muscle-wasting diseases, mostly using gene therapy rather than the injectable sold online.

Muscle & performance
⚠

Good to know: Most human evidence comes from gene-therapy delivery, not the standalone injectable peptide sold in research contexts; myostatin/activin blockade also raises theoretical cardiac and reproductive safety questions.

How does Follistatin 344 work?

The science

A glycoprotein that binds and neutralizes myostatin (GDF-8) and activin A, preventing them from engaging ActRIIB receptors and blocking the SMAD2/3 signaling that normally suppresses muscle growth.

Mechanism of action from published research — how the molecule behaves, not a claim about any product or any human-use effect.

What is Follistatin 344 researched for?

Studied for muscle hypertrophy and muscle-wasting diseases (e.g., inclusion body myositis, Becker muscular dystrophy), primarily via gene-therapy delivery.

  • Muscle & performanceStudied in muscle-growth, repair, and physical-performance research.
How far has the research gone?

In clinical trials (gene-therapy form); early-phase human trials exist for inclusion body myositis/muscular dystrophy, but the injectable FS-344 protein sold in research contexts lacks human trial data of its own.

Where the science stands — an approved drug is not the same as the research-grade material a vendor sells, which is unregulated regardless.

What should I check before buying?
  • Independent purity. Look for a third-party COA (Janoshik or MZ) showing a measured purity — not just a number the vendor typed.
  • Batch match. The strongest evidence is a certificate for the exact batch you’ll receive, attributed to this vendor — check the cross-verification on the listing.
  • Vendor reputation. See how the vendor is talked about in the community before trusting a new name.

Research context only — VialGrade never gives dosing, medical, or human-use guidance.

Current market

The Follistatin 344 market

Every Follistatin 344 listing we track — 11 in all. The standout picks first where the evidence supports them, then the full table, ranked by what a milligram really costs wherever the vendor published a strength we can read.

Open full market
Cheapest

Follistatin 344 1MG 1MG

Modern AminosB

$88$88.0/mg-37% vs median

Lowest price per mg that isn't flagged as suspiciously cheap.

UnavailableChecked 1 month ago

Freshest check

FOLLISTATIN 315 (FST-315) PEPTIDE 1MG VIAL 1MG

Umbrella LabsC-

$100$100.0/mg-29% vs median

The most recently re-verified listing on this market.

UnavailableChecked 11 hours ago

#3 by price

Follistatin-344 – 1MG

Core PeptidesB+

$138$138.0/mg-1% vs median

Ranked #3 of 9 listings by price per milligram.

UnavailableChecked 11 hours ago

#4 by price

Follistatin 344 1mg 1mg

Peptide ProsC+

$139$139.0/mg-1% vs median

Ranked #4 of 9 listings by price per milligram.

UnavailableChecked 11 hours ago

#5 by price

Follistatin-344 1mg 1mg

Swiss ChemsC-

$140$140.0/mg

Ranked #5 of 9 listings by price per milligram.

In stockChecked 11 hours ago

Compare by real cost

Every Follistatin 344 listing, cheapest per mg first

Sticker prices hide the size, so listings are ranked by what a milligram actually costs — with independently tested purity where it exists. All 11 are here: the last 2 are listings whose vendor never published a strength we can read, so they have no per-mg figure to sort on.

#VendorSizePricePer mgTested purityReal $/active mg
1Modern AminosUnavailable1mg total$88$88.0/mg——View
2Umbrella LabsUnavailable1mg total$100$100.0/mg——View
3Core PeptidesUnavailable1mg total$138$138.0/mg——View
4Peptide ProsUnavailable1mg total$139$139.0/mg——View
5Swiss Chems1mg total$140$140.0/mg——View
6Swiss Chems10mg totalKIT (10 vials) each$1,400$140.0/mg——View
7Biotech PeptidesUnavailable1mg total$162$162.0/mg——View
8PurerawzUnavailable1mg total$164$164.0/mg——View
9Purerawz1mg total$186$185.7/mg——View
Listed, but not rankable — no published strength to price per mg

Open the full Follistatin 344 market

Real $/active mg divides the price-per-mg by the measured purity — the honest cost of the actual peptide, so a 90%-pure vial isn’t compared as if it were 99%. Too cheap? flags a listing far below the market rate — often underdosing or a fake, not a deal. The crown marks the cheapest non-outlier; best value marks the lowest real cost per active mg. A vendor shown as Unavailable or Low stock is priced here but not currently buyable.

What the research says

Scientific evidence & regulatory status

What the published literature actually shows about Follistatin 344 — separate from any vendor’s marketing. Each finding links to its paper. This is education, not medical or dosing advice.

Regulatory status

No FDA-approved drug

Not FDA-approved and has no approved indication anywhere identified; the only completed trials of the FS344 sequence were early-phase gene-therapy studies in muscular dystrophy, not studies of an injectable peptide. WADA prohibits follistatin at all times as a myostatin-binding protein (S4.3).

US legal statusBanned in drug-tested sport (WADA/USADA)

Research-use-only — not FDA-approved

Sold “for research use only,” this compound is not FDA-approved for human use and has not been evaluated for safety, purity, or sterility in people. It is generally not a scheduled controlled substance, so buying it as a research chemical is typically not itself a drug crime — but marketing or using it as a drug is not lawful, and it is not a dietary supplement.

Read the full US law →

General information, not legal or medical advice. VialGrade sells nothing and encourages no human use.

Research notes aren’t product proof

Research summaries describe published literature and market data only. They do not establish the identity, quality, safety, or legal status of any listed physical product.