FDA warning letters that name peptides
Regulatory fact: FDA warning letters database. 29 letters, newest first. Last checked .
| Letter date | Sent to | Peptides named | What FDA cited |
|---|---|---|---|
| Aug 24, 2026Posted Sep 1, 2026 | NuScience Peptides LLCOnline peptide sellerLetter on fda.gov | Tirzepatide ("GLP-2 Tirz"), Semaglutide ("GLP-1 Sema"), Retatrutide ("GLP-3 RT"), Survodutide, Mazdutide, PT-141 (bremelanotide), Tesamorelin, Tesamorelin and ipamorelin blend | Research-use-only label, Health claims, Bacteriostatic water, Coded names, Calculator or dosing guide |
| Aug 24, 2026Posted Sep 1, 2026 | Peak Performance PeptidesOnline peptide sellerLetter on fda.gov | Retatrutide ("GLP-3R"), Semaglutide, SS-31 (elamipretide), PT-141 (bremelanotide), Tesamorelin | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Aug 24, 2026Posted Sep 1, 2026 | Peptide Partners LLCOnline peptide sellerLetter on fda.gov | Semaglutide ("GLP-1 S"), Tirzepatide ("GLP-2 T"), Retatrutide ("GLP-3 Reta"), SS-31 (elamipretide), Tesamorelin, PT-141 (bremelanotide) | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Aug 24, 2026Posted Sep 1, 2026 | Royal Peptides LLCOnline peptide sellerLetter on fda.gov | Tirzepatide, Semaglutide, Retatrutide, SS-31 (elamipretide), PT-141 (bremelanotide), Tesamorelin, "BIMORELIN" | Research-use-only label, Health claims, Bacteriostatic water, Calculator or dosing guide |
| Aug 24, 2026Posted Sep 1, 2026 | TXP Innovations LLC dba Tex PeptidesOnline peptide sellerLetter on fda.gov | Semaglutide ("GLP-1 SEM"), Tirzepatide ("GLP-2 TRZ"), Retatrutide ("GLP-3 RT"), SS-31 (elamipretide), Tesamorelin, PT-141 (bremelanotide) | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Jun 17, 2026Posted Jun 23, 2026 | Wholesale PeptideOnline peptide sellerLetter on fda.gov | Prostamax, Gonadorelin | Research-use-only label, Health claims |
| Mar 31, 2026Posted Apr 7, 2026 | Gram PeptidesOnline peptide sellerLetter on fda.gov | Retatrutide ("GLP-1-R peptide"), Tirzepatide ("GLP-2 peptide") | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Mar 31, 2026Posted Apr 7, 2026 | Lovega LLC dba Pink Pony PeptidesOnline peptide sellerLetter on fda.gov | Tirzepatide ("GLP-2 TZ"), Retatrutide ("GLP-3 RT") | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Mar 31, 2026Posted Apr 7, 2026 | Mile High Compounds LLCOnline peptide sellerLetter on fda.gov | Semaglutide ("GLP-1 SM"), Tirzepatide ("GLP-2 TRZ"), Retatrutide ("GLP-3 RT") | Research-use-only label, Health claims, Bacteriostatic water, Coded names, Calculator or dosing guide |
| Mar 31, 2026Posted Apr 7, 2026 | PekCura LabsOnline peptide sellerLetter on fda.gov | "GLP-1-S," "GLP-2-T" and "GLP-3-R" (code names), Cagrilintide ("C/T Blend" with "GLP-2-T") | Health claims, Bacteriostatic water, Coded names |
| Mar 31, 2026Posted Apr 7, 2026 | Prime SciencesOnline peptide sellerLetter on fda.gov | Cagrilintide, Retatrutide ("GLP1-R"), "GLP1-S" and "GLP1-T" (code names), Mazdutide | Research-use-only label, Health claims, Bacteriostatic water, Coded names |
| Jan 20, 2026Posted Mar 3, 2026 | GenoGenix LLCCompounderLetter on fda.gov | Thymosin beta-4, Retatrutide, Semaglutide, Tirzepatide, Epitalon ("Epithalon") | Not eligible for compounding, No biologics license |
| Dec 8, 2025Posted Dec 23, 2025 | Darmerica, LLCIngredient distributorLetter on fda.gov | Retatrutide, Cagrilintide, SS-31 (elamipretide) acetate, Hexarelin acetate, Thymogen, Larazotide acetate, Buserelin acetate | Not eligible for compounding, Drug listing |
| Sep 9, 2025Posted Sep 16, 2025 | Amazing MedsTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide | Not eligible for compounding, Health claims |
| Sep 9, 2025Posted Sep 16, 2025 | ASN-LABSTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide, Tirzepatide | Not eligible for compounding, Health claims |
| Sep 9, 2025Posted Sep 16, 2025 | EA WORKS Limited Liability Company dba Trust LabsTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide, Tirzepatide | Not eligible for compounding, Health claims |
| Sep 9, 2025Posted Sep 16, 2025 | GenLabMedsTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide, Tirzepatide | Not eligible for compounding, Health claims |
| Sep 9, 2025Posted Sep 16, 2025 | GLP-1 SolutionTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide, Tirzepatide | Not eligible for compounding, Health claims |
| Sep 9, 2025Posted Sep 16, 2025 | MedClub by Dr. JennTelehealth sellerLetter on fda.gov | Retatrutide, Semaglutide | Not eligible for compounding, Health claims |
| Feb 26, 2025Posted Mar 11, 2025 | USApeptide.comOnline peptide sellerLetter on fda.gov | Semaglutide, Tirzepatide | Research-use-only label, Health claims, Bacteriostatic water |
| Dec 10, 2024Posted Dec 17, 2024 | Prime Vitality, Inc. dba Prime PeptidesOnline peptide sellerLetter on fda.gov | Semaglutide, Retatrutide | Research-use-only label, Health claims |
| Dec 10, 2024Posted Dec 17, 2024 | Summit Research PeptidesOnline peptide sellerLetter on fda.gov | Semaglutide, Retatrutide, Cagrilintide, Tirzepatide, Mazdutide | Research-use-only label, Health claims |
| Dec 10, 2024Posted Dec 17, 2024 | SwisschemsOnline peptide sellerLetter on fda.gov | Semaglutide, Retatrutide | Health claims |
| Dec 10, 2024Posted Dec 17, 2024 | Xcel Research LLCOnline peptide sellerLetter on fda.gov | Retatrutide, Cagrilintide (alone and with semaglutide), Mazdutide, Semaglutide, Survodutide, Sermorelin | Research-use-only label, Health claims |
| Feb 7, 2024Posted Feb 13, 2024 | Synthetix Inc. DBA Helix Chemical SupplyOnline peptide sellerLetter on fda.gov | Semaglutide, Tirzepatide | Research-use-only label, Health claims |
| Feb 7, 2024Posted Feb 13, 2024 | US Chem LabsOnline peptide sellerLetter on fda.gov | Semaglutide, Tirzepatide, Thymalin | Research-use-only label, Health claims |
| Jun 12, 2023Posted Jun 20, 2023 | Warrior Labz SARMSOnline peptide sellerLetter on fda.gov | BPC-157 (injectable and nasal spray), TB-500 (injectable and nasal spray), MK-677 (ibutamoren), not a peptide | Research-use-only label, Health claims |
| Jan 26, 2022Posted Feb 8, 2022 | Innoveix Pharmaceuticals IncCompounderLetter on fda.gov | Sermorelin, Ipamorelin, AOD-9604 | Sterility |
| Nov 10, 2021Posted Nov 16, 2021 | Advanced Nutriceuticals, LLC dba The Guyer Institute of Molecular MedicineCompounderLetter on fda.gov | BPC-157, Thymosin alpha-1 ("thymosin alpha"), Thymosin beta-4 ("thymosin beta"), LL-37, Selank, Semax, Cerebrolysin | Not eligible for compounding |