TB-500·WASHINGTON·VERIFIED MAY 13, 2026
Is TB-500 legal in Washington?
CAVEATS APPLY
No FDA approval; WADA S2 prohibited; PCAC vote on 503A bulks scheduled July 23, 2026; FDA Warning Letters target retail peptide vendors. No state-level peptide restrictions beyond federal law in Washington.
CATEGORY · NO APPROVAL
Full status breakdown
FEDERAL · STATE · SPORT-BODYFederal status
FDA approval
no approval
DEA scheduling
not scheduled
503A compounding
FDA Warning Letters
Shortage status
not currently on shortage list
Sale framing
Research-use-only posture: FDA rejects RUO defense for TB-500; Warrior Labz and US Chem Labs are direct precedents.
Personal possession: Not federally scheduled; not federally criminalized for end-user possession. Seller risk is high.
Washington — state-specific
Sport-body status
WADA 2026
on prohibited list · class S2 · both
S2 (growth factors / tissue repair peptides); also S0 (non-approved substance).
USADA
banned
NCAA
banned
What we couldn’t verify
Also known as
5 ALIASESTB-500 is also marketed or referenced under the following names (vendor pseudonyms, brand names, chemical identifiers):
Thymosin Beta-4 fragmentTB4 fragmentTB-500 acetateThymosin β4 fragment 17-23LKKTETQ peptide
Related
FOLLOW-ONS- Back to peptide legality lookup — pick a different compound or state
- TB-500 research guide — mechanism, dosing math, vendor audits, COA data
- Peptide pricing index — what each compound costs per mg across audited vendors
- Janoshik COA verifier — a separate question from legality: does the COA the vendor cites actually exist?
TB-500 legality in other US states
State-by-state legal status for the same compound. Federal classification holds, state law varies.
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