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Evidence-based GLP-1 & peptide discussion since 2023
ForumsBuyer BewareDue diligence checklist before ordering from ANY vendor Page 2

Due diligence checklist before ordering from ANY vendor

VendorMark Wed, May 27, 2026 at 6:26 AM 10 replies 383 viewsPage 2 of 2
Dr.GutHealth
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May 27, 2026 at 12:47 PM#6
VendorMark said:
Prices dramatically below market are the strongest single signal, and the reason is arithmetic rather than suspicion.

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 16 orders across 4 vendors: average purity 97.0%, zero sterility concerns, 2 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.

28 23VanRx_Mike, steve_okc, dave_SLC and 25 others
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mark_tokyo
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May 27, 2026 at 3:17 PM#7

Following on from Dr.EndoEP — and this may be the naive question:

What a vetting checklist should actually contain, as opposed to a list of things that are easy to fake?

27 22bri_stats, pete_manc_UK, anna.melb_AU and 24 others
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BariatricNurseD
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May 27, 2026 at 5:47 PM#8
Dr.GutHealth said:
Vendor reputation tracking for vendor vetting: I maintain a personal spreadsheet with every order I've placed — date, vendor, batch number, Janoshik…

Shipping damage protocol for vendor vetting orders: if your package arrives with visible damage, temperature excursion, or broken vials:

  • Photograph EVERYTHING before discarding packaging
  • Note the temperature of the cold pack (liquid = possibly too warm)
  • Contact the vendor within 24 hours with photos
  • Request a replacement shipment or refund
  • Do NOT use potentially compromised medication

Reputable vendors will replace damaged shipments without argument. If they push back, that's a red flag about the vendor.

26 21josh_phd_bmore, roxy_nash, tony_orlando and 23 others
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Janoshik Analytical — Independent Testing

Trusted third-party HPLC & mass spectrometry analysis. Verify peptide purity with the lab the community relies on. Independent. Accurate. Transparent.

Verify Your Peptides

GL Biochem (Shanghai) Ltd. — Direct Manufacturer

Est. 1998. The synthesis house behind the vials you send for testing. ISO 9001 and cGMP certified, 1,500+ staff, batch-specific COA with every order.

Browse GL Biochem
VendorMark
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May 27, 2026 at 8:17 PM#9

Reporting back.

Went back through my own correspondence with an earlier supplier and the warning signs were all there in the replies, weeks before the quality changed. I was reading the product and not the behaviour.

25 20Dr.PeteFamMed, claudia_zurich, nancy_portland and 22 others
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Dr.MetabolicMD
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May 28, 2026 at 8:16 AM#10
BariatricNurseD said:
Shipping damage protocol for vendor vetting orders: if your package arrives with visible damage, temperature excursion, or broken vials: Photograph…

Agreed, with a caveat about community reputation: it is a lagging indicator. Reports arrive weeks after orders, so a supplier can look excellent for a month after quality has already changed.

Last edited: May 28, 2026 at 10:16 AM
25 23GenomicsKate, Dr.ObesityMed, HealthEcon_DC and 22 others
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