Is Thymalin legal?
Not as a drug. Thymalin has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. It is approved in Russia, which has no effect in the US. Pharmacies cannot compound it.
DESCRIBES THE LAW · NOT LEGAL ADVICE · NO DOSING INFORMATION
Federal, compounding and sport status
CHECKED 12 OCT 2026Federal status
Sport-body status
What we couldn’t verify
State rules
NONE FOUNDWe found no state statute, board rule or enforcement action that names Thymalin. The federal position above applies in all 50 states and DC.
Questions
3 ANSWERSIs Thymalin legal in the US?
Not as a drug. Thymalin has no FDA approval, so selling it for human use breaks federal drug law, and a 'research use only' label does not protect a seller whose site signals human use. It is not a controlled substance, and possessing it is not a federal crime. It is approved in Russia, which has no effect in the US. Pharmacies cannot compound it.
Can a pharmacy compound Thymalin?
Not in FDA's 503A categories under this name (Category 3 lists thymulin acetate, a different substance). Not eligible.
Is Thymalin banned in sport?
It is not on the WADA 2026 Prohibited List. Not named. Thymalin is registered as a drug in Russia, so S0 does not apply on its text.