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ForumsBuyer Beware⚠ 50+ FDA warning letters sent to peptide vendors in 2025 — looking for input

⚠ 50+ FDA warning letters sent to peptide vendors in 2025 — looking for input

MariaRD Mon, Apr 13, 2026 at 7:51 AM 14 replies 878 viewsPage 1 of 3
MariaRD
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Jun 2024
New Mexico
Apr 13, 2026 at 7:51 AM#1

Six orders from the same supplier over eight months, every one independently tested, and the consistency is the part worth reporting rather than any single result.

What I actually want to know is what a vetting checklist should actually contain, as opposed to a list of things that are easy to fake.

I would rather have one careful answer than five confident ones.

35 5Dr.NutriCornell, pam_stl, wei_SG and 32 others
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Dr.GutHealth
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Mar 2024
Minnesota
Apr 13, 2026 at 7:56 AM#2

This one has a reasonably settled answer, so here it is. Prices dramatically below market are the strongest single signal, and the reason is arithmetic rather than suspicion. Synthesis, testing, and cold-chain shipping have floors. A price well under the floor means something was skipped, and the two things that get skipped are testing and content.

34 4tyler_CSCS, VanRx_Mike, steve_okc and 31 others
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gary_naperville
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Oct 2024
Naperville, IL
Apr 13, 2026 at 8:01 AM#3
Dr.GutHealth said:
Prices dramatically below market are the strongest single signal, and the reason is arithmetic rather than suspicion.

Right, and one flattering data point from a group buy is not consistency. Consistency means separate batches, separately commissioned, over months.

33 3TomTeleRx, DoseLogDan, SleepFixSam and 30 others
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lucas_SP_BR
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Jun 2024
São Paulo, BR
Apr 13, 2026 at 8:06 AM#4
MariaRD said:
Six orders from the same supplier over eight months, every one independently tested, and the consistency is the part worth reporting rather than any…

Can confirm the pattern MariaRD describes. The pattern that distinguishes a bad batch from an exit is behaviour rather than product. A bad batch comes with communication, a reshipment offer and a batch number. An exit comes with slower replies, pressure toward less reversible payment methods, sudden discounting, and the same reassurance repeated without any new information. The product tells you less than the correspondence does.

Happy to go further on any of that.

32 2KarenAZ_mom, zoe_NC, Dr.ObesityLA and 29 others
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TinaHashiRN
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Sep 2024
Raleigh, NC
Apr 13, 2026 at 8:33 AM#5

Clinical perspective, offered as context rather than as advice.

Vendor reputation tracking for vendor vetting: I maintain a personal spreadsheet with every order I've placed — date, vendor, batch number, Janoshik result, personal efficacy assessment (1-5 scale), and any issues.

After 18 orders across 3 vendors: average purity 97.2%, zero sterility concerns, 1 shipping issues (all resolved). This data gives me confidence in my current source and documentation if issues arise.

I encourage everyone to track their orders systematically. Community data aggregation makes us all safer.

31 1MikeNYC_runner and 28 others
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