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JEEP — independent test log

Every third-party result a GLP Research Hub member has paid for and published on JEEP. Vendor-supplied COAs are not on this page — only tests where a member sent a vial to Janoshik, Medutest, PeptideMeter or VendorInvestigate themselves.

Summary
6Results
98.7%Mean purity
0.8Spread (pts)
+0.02Mean vs claim
A small negative mean is normal — inter-lab variance on this assay runs one to two points either way. A consistent negative gap is not.
Every logged result
DateServiceCompoundBatchClaimedResult
2026-06-18JanoshikRetatrutide 10mgRT-260499.0%98.9%
2026-04-02PeptideMeterTirzepatide 15mgTZ-260398.5%98.8%
2026-01-27MedutestSemaglutide 10mgSG-251299.0%98.6%
2025-10-09JanoshikCagrilintide 5mgCG-250998.0%98.4%
2025-05-21VendorInvestigateTirzepatide 10mgTZ-250498.5%98.3%
2024-12-03JanoshikSemaglutide 5mgSG-241199.0%99.1%
Results ordered newest first. Batch identifiers as printed on the vendor documentation.

How to read this table

Three columns matter and they are easy to conflate. Claimed is what the vendor documentation said. Result is what an independent service measured on a vial a member actually received. The gap between them is the only number on this page with any predictive value — the absolute purity figure tells you much less than whether the vendor's own claim survives contact with a lab.

A vendor claiming 98% and delivering 98% is more trustworthy than one claiming 99.5% and delivering 98.6%, even though the second vial is nominally better. Consistency beats peak performance when you cannot test every order.

Also note what this table is not: it is not a survey. These are retail-quantity purchases by individual members, self-selected, self-funded and self-reported. JEEP has 6 entries here; the vendors with more entries look more variable partly because more sampling reveals more variance.

Services used

All four independent services appear across the vendor directory: Janoshik (HPLC and mass spec, the most-used by members), Medutest, PeptideMeter (which also publishes vendor-level trend data) and VendorInvestigate. Where two services tested the same batch we list both rows rather than averaging them, because the disagreement is the interesting part.

Independent test trend

6 logged results, oldest to newest. Range 98.3–99.1%.

Results are member-funded tests from Janoshik, Medutest, PeptideMeter and VendorInvestigate.
Sponsored

Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

sigmaaldrich.com
Other source pages
All 20 vendors →
How a source page works

A source page is a record, not a review. It collects the verification log, every independent test a member has paid for and published, shipping-lane reports and member reviews. Ratings are this community's own — other communities score the same vendors slightly differently, which is what you would expect from independent groups. We take no money from any vendor and do not accept a vendor-supplied COA as evidence on its own. Each source page does link the vendor's own storefront, marked nofollow and sponsored, so you can read their account against ours.

Where JEEP sells

Guangzhou JEEP Biotechnology Co., Ltd. sells from its own storefront. The link is marked nofollow and sponsored and is here so you can check what they claim against the log above. Nobody here is paid for it, and a link is not a recommendation.

Visit JEEP at jeepbio.com →

A good record predicts your batch; it does not guarantee it, and no storefront can. Check the lot on the vial against the lot on the certificate.

Before you read on

Several compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.

Full disclaimer →