Enforcement archive

FDA warning letters to peptide sellers

Every entry links to the official document on fda.gov and reproduces the product names exactly as FDA writes them. Entries are never described as resolved without authoritative evidence, and an affiliate relationship never removes or softens an entry.

14 documents · all source URLs confirmed to resolve on 2026-07-28

The Constitution Avenue entrance of the National Archives Building in Washington, DC.
Every entry below links to a document held in the public record.Public domain — US National Archives
A pattern visible across these documents

Several firms did not sell peptides under their drug names. FDA's letters record products offered as “GLP-2 TZ”, “GLP-3 RT”, “GLP-1-S” and “GLP-1-R peptide” — code for tirzepatide, retatrutide and semaglutide. One firm's own site called retatrutide a “GLP-1-R peptide”; another sold “GLP-2-T”.

The naming did not change how FDA treated the products. If a seller lists items under codes rather than the substance name, that is a documented characteristic of firms that have received warning letters — and it makes a certificate of analysis impossible to match to a product.

2026

Wholesale Peptide

FDA · Warning letter · 2026-06-17
Products as FDA names them See the official document
Stated subject FDA website review; introduction of unapproved new drugs into interstate commerce.
Status: Response requested; no evidence of resolution published Read the official FDA document →

Gram Peptides

FDA · Warning letter · 2026-03-31
Products as FDA names them "Retatrutide" (referred to by the firm as "GLP-1-R peptide"), "Tirzepatide" (referred to as "GLP-2 peptide"), and "Bacteriostatic Water for Injection"
Stated subject FDA reviewed the firm's website and states the products are unapproved new drugs offered for sale in the United States.
Status: Response requested; no evidence of resolution published Read the official FDA document →

Lovega LLC dba Pink Pony Peptides

FDA · Warning letter · 2026-03-31
Products as FDA names them "GLP-2 TZ," "GLP-3 RT," and "Bacteriostatic Water"
Stated subject FDA states the products are unapproved new drugs under section 505(a).
Status: Response requested; no evidence of resolution published Read the official FDA document →

PekCura Labs

FDA · Warning letter · 2026-03-31
Products as FDA names them "GLP-1-S," "GLP-2-T," "GLP-3-R" (all variations) and "Bacteriostatic Water"
Stated subject FDA states the products are unapproved new drugs offered for sale in the United States.
Status: Response requested; no evidence of resolution published Read the official FDA document →

Prime Sciences

FDA · Warning letter · 2026-03-31
Products as FDA names them "Cagrilintide," "GLP1-R," "GLP1-S," "GLP1-T," "Mazdutide," and "BAC water"
Stated subject FDA states the products are unapproved new drugs, notwithstanding site statements that they are for "laboratory research purposes only" and "not for human consumption, medical use or veterinary use".
Status: Response requested; no evidence of resolution published Read the official FDA document →

Mile High Compounds LLC

FDA · Warning letter · 2026-03-31
Products as FDA names them "GLP-1 SM," "GLP-2 TRZ," "GLP-3 RT," and "BAC Water"
Stated subject FDA states the products are unapproved new drugs, notwithstanding site statements that they are for "in vitro research and educational purposes only" and "not for human or veterinary consumption".
Status: Response requested; no evidence of resolution published Read the official FDA document →

2025

Pinnacle Professional Research dba Pinnacle Peptides

FDA · Warning letter · 2025-12-12
Products as FDA names them Products marketed as selective androgen receptor modulators (SARMs): "SARM'S S4 ANDARINE," "LGD-4033," "MK-2866"
Stated subject FDA states the products are unapproved new drugs under section 505(a). Despite the company name, the products at issue are SARMs, not peptides.
Status: Response requested; no evidence of resolution published Read the official FDA document →

GLP-1 Solution

FDA · Warning letter · 2025-09-09
Products as FDA names them Compounded retatrutide, semaglutide and tirzepatide products
Stated subject FDA states retatrutide products are unapproved new drugs and misbranded drugs, and that semaglutide and tirzepatide claims are false or misleading.
Status: Response requested; no evidence of resolution published Read the official FDA document →

GenLabMeds

FDA · Warning letter · 2025-09-09
Products as FDA names them Compounded drug products including retatrutide, semaglutide and tirzepatide
Stated subject FDA states retatrutide products are unapproved new drugs and misbranded drugs, with claims false or misleading under sections 502(a) and 502(bb).
Status: Response requested; no evidence of resolution published Read the official FDA document →

USApeptide.com

FDA · Warning letter · 2025-02-26
Products as FDA names them Semaglutide and tirzepatide drug products
Stated subject FDA states the website "introduces into interstate commerce misbranded and unapproved new drugs" in violation of sections 301(a), 301(d), 301(k), 503(b) and 505(a), notwithstanding "research use only" and "not for human consumption" statements.
Status: FDA requested the site cease offering the products to U.S. consumers; products "may be detained or refused admission" Read the official FDA document →

2024

Summit Research Peptides

FDA · Warning letter · 2024-12-10
Products as FDA names them "Semaglutide," "Retatrutide," "Cagrilintide," "Tirzepatide" and "Mazdutide"
Stated subject FDA cites violation of sections 505(a) and 301(d), notwithstanding "RESEARCH USE ONLY" labelling. The letter warns that failure to address the matter "may result in legal action including, without limitation, seizure and injunction".
Status: Response requested; no evidence of resolution published Read the official FDA document →

Prime Vitality, Inc. dba Prime Peptides

FDA · Warning letter · 2024-12-10
Products as FDA names them "Semaglutide" and "Retatrutide"
Stated subject FDA states the products are unapproved new drugs, notwithstanding labelling for "research purposes only" and "not for human consumption or clinical use".
Status: Response requested; no evidence of resolution published Read the official FDA document →

2023

Warrior Labz SARMS

FDA · Warning letter · 2023-06-12
Products as FDA names them SARMs plus "BPC-157" (injectable and nasal spray) and "TB-500" (injectable and nasal spray)
Stated subject FDA states: "Despite statements … marketing your products for 'research purpose only' and 'not for human consumption,' evidence obtained from your website establishes that your products are intended to be drugs for human use."
Status: Response requested; no evidence of resolution published Read the official FDA document →

2020

Tailor Made Compounding, LLC

FDA · Warning letter · 2020-04-01
Products as FDA names them Compounded products using Follistatin, GHRP-2, GHRP-6, AOD-9604, BPC-157, bremelanotide (PT-141), DSIP, epitalon, GHK-Cu, ipamorelin, LL-37, melanotan II, PEG-MGF, selank, semax, CJC-1295 and others
Stated subject FDA states the bulk drug substances used "are not eligible for the exemptions provided by section 503A(a)", and also cites insanitary conditions.
Status: FDA stated it "cannot fully evaluate the adequacy" of corrective actions; some substances removed from formulary, others unaddressed Read the official FDA document →

How to read a warning letter

A warning letter states FDA's position at the date it was issued. It is not a court finding, and it does not by itself establish that a company is still operating in the way the letter describes. Where a firm has responded or corrected, that would appear in a separate, later document — and because we have no authoritative evidence of resolution for any entry above, none is described as resolved.

What a letter does establish is that FDA reviewed a specific website on a specific date and reached a stated conclusion about specific products. That is the fact we record — nothing more.