Legal status · United States
Is FLGR-242 legal in the United States?
No. FLGR-242 is not an approved medicine in the United States; its classification is "Not approved; sold 'for research use only'". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. Human evidence: Preliminary.
FLGR-242 in the United States at a glance
| Classification | Not approved; sold 'for research use only' |
|---|---|
| Note | Prohibited in sport by class (WADA S2) |
| FDA approval status | Not approved; no IND; sold as a research chemical |
| Evidence level | Preliminary (research strength: Preliminary) |
| Reviewed | Sep 2026 |
Classification and note come from the FLGR-242 profile, checked against U.S. Food and Drug Administration (FDA) listings at the reviewed date.
What this means
- 01
No product containing FLGR-242 is approved by FDA for any use in the United States, so nothing on the market is authorized for people.
- 02
"Research use only" is a vendor label, not a legal category that permits human use. It does not exempt a product from medicines law.
- 03
Importing, supplying or promoting it for human use can fall under medicines legislation in the United States. This page is general information, not legal advice.
What FLGR-242 is
A gray-market recombinant follistatin fragment marketed since late 2025 as a myostatin trap that builds muscle; there are no published studies, no pharmacokinetics and no safety data on the molecule itself.
FLGR-242 is sold as a truncated follistatin protein with a claimed albumin-binding domain, at prices from a few hundred to several thousand dollars per vial. Vendors and the influencer who popularized it in November 2025 describe half a pound to a pound of muscle per week with most gains retained after stopping.
Mechanism: Follistatin-type binding of myostatin and activins prevents them from engaging ActRIIA/ActRIIB receptors, releasing the Smad2/3 brake on muscle protein synthesis.
Regulatory history: Not approved; no IND; sold as a research chemical
How FDA treats this kind of product
Approves prescription drugs by indication and polices unapproved products, including peptides sold online. Compounding pharmacies may prepare some compounds under a prescription when the FDA places them on a permitted bulk-substances category.
The classification above is the The Longevity Archive reading of U.S. Food and Drug Administration listings for FLGR-242 at the reviewed date, not a legal opinion. Rules change, and importing, prescribing and possessing a compound can each be treated differently. Check the regulator directly before acting on anything here.
FLGR-242 in other countries
Frequently asked questions
Is FLGR-242 legal in the United States?
No. FLGR-242 is not an approved medicine in the United States; its classification is "Not approved; sold 'for research use only'". Nothing containing it is authorized for any use in people. Vials labeled "for research use only" are not exempt: that label does not make human use lawful. Human evidence: Preliminary. Note: Prohibited in sport by class (WADA S2)
Can I buy FLGR-242 in the United States?
No approved product exists to buy. In the United States FLGR-242 is classified as "Not approved; sold 'for research use only'", so there is no licensed pharmacy product. Vendors selling it "for research use only" are not selling it for human use, and that label does not change its legal status. This site does not list or recommend vendors. Note: Prohibited in sport by class (WADA S2)
Is FLGR-242 FDA approved?
No. FDA status: Not approved; no IND; sold as a research chemical. Current US classification: "Not approved; sold 'for research use only'". Evidence level: Preliminary.
Related compounds in the United States
Full research profile
Mechanism, cited studies, FDA status and the full legal summary for FLGR-242 live on its compound profile.
FLGR-242 profileThis page is general information about the regulatory status of FLGR-242 in the United States, current as of Sep 2026. It is not legal advice, and classifications change; check U.S. Food and Drug Administration directly or consult a lawyer for a specific situation. Educational use only. This database summarizes published research. It is not medical advice and contains no dosing protocols or recommendations for personal use. The Longevity Archive has no vendor relationships and does not recommend where to buy anything.