Overall findings
Most lab-test failures
Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
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2357 One Chance Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-05-01Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
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2358 GordonPeps Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-30Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2359 OA LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-30Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2360 Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-30Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2361 Proof Peptides / Homopeptide.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-29Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2502 Shanghai Chinqesen Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-28Latest test date< 1 year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2473 peptidesfactorycn.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-27Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2362 JM Trading Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-25Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2363 Qureshi Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-25Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2364 Surfside Aminos Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-25Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2365 PeptX Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-23Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2366 Andre Bosch LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-19Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2367 Chained Aminos - ER Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-19Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2368 Elevated Aminos Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-18Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2369 Lioncore, LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-18Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2370 AetherForge Health Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-15Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2371 Thrive Labz Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-15Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2372 Lexen Peptide Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2373 CKS Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-12Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2374 D RESEARCH Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-11Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2375 NeurAmino Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-11Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2376 BioBlend Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2377 Hermetica Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2378 JA Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2379 Valence Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2474 Sierra Pacific LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-09Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2380 Trevitue LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-07Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2381 JF Peps Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-04-02Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2475 Diamond Slim LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-31Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2503 Shandong Ranhang Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-18Latest test date< 1 year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2476 G-Way Labs Research Company Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-17Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2382 Great Basin Bio Supply Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-16Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2383 Amno Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-15Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2384 Cellu Nova Inc. Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2504 Million Pharm Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-03-12Latest test date< 1 year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2385 Exilio International Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-27Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2505 Iron Lion Lab Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-26Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2386 MissPeptide Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-25Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2506 Hydrapharm Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-25Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2507 Shanxi Andashihai Technology Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-20Latest test date< 1 year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2387 Piratepharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-19Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2388 TOPeptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-18Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2477 Peptides For Less Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-18Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2389 Mapping Aminos/Wllybio.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-17Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2390 Stoepler Inc Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2391 1GLP.SHOP Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-11Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2392 Elevated Amino Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-11Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2393 Pro Beauty LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2394 Zyron Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-09Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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2395 Pro-Line Life Sciences Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-02-07Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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More reports means more evidence to inspect, not better quality. Each report counts once. Purity and amount percentages require at least five applicable results; explicit endotoxin failures are always shown. Missing measurements are not passes.
Understand the coverage
- Published COA report entries
- 121,035
- Ranked vendors across all seller groups
- 3,071
- Index refresh
Report dates are shown with each test. International classification does not establish factory ownership. U.S. resale does not establish U.S. manufacture.
The first 20 identities in each seller group’s original report-count ranking are shown to signed-in members. Changing the sort order does not change access. Vendors ranked 21 and below in those rankings remain named.
- International vendors
- 30 reviewed vendors · 7,704 unique reports · 19 observed in 30 days
- Compare manufacturers, exporters and other international sellers by their independent lab reports.
- Domestic resellers
- 102 reviewed vendors · 17,263 unique reports · 41 observed in 30 days
- Compare U.S.-based resellers. The seller is domestic; the product may still come from an overseas supplier.
- Seller type not reviewed
- 2,939 vendors · 57,120 unique reports · 363 observed in 30 days
- Sellers with independent lab reports whose seller type we have not reviewed yet.
Each report counts once, even when it tests several compounds or appears in multiple archives. Purity and dose results describe submitted samples, not everything a vendor sells. The methodology and known limitations explain eligibility and exclusions.
Explore recorded findings and compound comparisons
What is a domestic reseller?
A reseller buys from another supplier and sells under its own storefront or brand. Here, domestic means U.S.-based. Local shipping does not mean the product was made in the U.S. or tested after resale. Check the report for the actual batch.
Follow the evidence
Where the tests went wrong.
Recorded failures alongside the number of applicable tests. Choose a seller group to see the results behind each count.
Contamination findings
Failed endotoxin tests
Compare repeated failures in tests for bacterial endotoxins.
Below 97% purity
Low purity results
Vendors with the most measured purity results below 97%.
At least 10% short
Underfilled samples
See where tests found less compound than the stated amount.
Identity findings
Compound not found
Vendors with the most results that did not find the labeled compound.
What these counts include
All available results in the lab-findings comparisons. Each category counts only applicable tests; missing measurements do not count as passes. One sample can appear in several categories, but counts once in the overall total. These are counts of tested samples, not failure rates for everything a vendor sells.
International vendors: Recorded lab dates 2022-06-24 to 2026-10-20. 24 measured results have no usable date.
Domestic resellers: Recorded lab dates 2020-01-31 to 2026-10-22. 143 measured results have no usable date.
Choose your compound
Compare lab results
by compound.
Explore measured results, compare vendors and open their lab reports. These figures cover the same reviewed seller groups as the findings above.
GLP-1 and related compounds
RetatrutideLab results by vendor↗ International vendors1,779 measured results11.2–100% purity in 1,714 results Domestic resellers2,067 measured results33.7–100% purity in 1,915 results TirzepatideLab results by vendor↗ International vendors1,282 measured results40.4–100% purity in 1,248 results Domestic resellers1,436 measured results55.9–100% purity in 1,332 resultsGrowth hormone and related compounds
HGHLab results by vendor↗ International vendors79 measured results90.45–99.9% purity in 76 results Domestic resellers9 measured results96.14–99.84% purity in 9 results TesamorelinLab results by vendor↗ International vendors400 measured results12.7–100% purity in 380 results Domestic resellers582 measured results48.94–99.99% purity in 525 resultsRanges include measured purity above 0%. “Compound not found” is counted separately. The report library has broader coverage; vendor rankings apply their own minimum test counts.
Beyond the lab
What was it like to order?
Buyer reviews cover delivery, communication and service. Each keeps its date and source.