Overall findings
Most lab-test failures
Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
Review testing histories, buyer reports and recorded concerns in one directory.
1442 Encore Research Labs Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-08-13Latest test date< 1 year COA history 14% underdosed0% low purity 3 5
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1450 SmallChainAmino.com Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-08-11Latest test date< 1 year COA history 0% underdosed0% low purity 2 6
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1455 Changyuan Polypeptide Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-08-09Latest test date< 1 year COA history Fewer than 5 applicable tests 0 8
Lab evidence
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1431 In Lab Peptides Science Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-08-06Latest test date< 1 year COA history 0% underdosed0% low purity 5 3
Lab evidence
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1456 Guangdong Peptide Research Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-08-06Latest test date< 1 year COA history 2 endotoxin failures 0 8
Lab evidence
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1386 Wheat pharmaceutical Biotechnology Co. Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-31Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1443 Helix Lab Research Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-30Latest test date< 1 year COA history 0% underdosed0% low purity 3 5
Lab evidence
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1387 www.uwa- biotech.com Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-29Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1444 EJ Solis Ventures LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-29Latest test date< 1 year COA history 0% underdosed0% low purity 3 5
Lab evidence
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1424 RVA Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-28Latest test date< 1 year COA history 0% underdosed0% low purity 6 2
Lab evidence
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1425 Lejian Biotech Peptide Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-17Latest test date< 1 year COA history 0% low purity 6 2
Lab evidence
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1426 Depris Inc. Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-15Latest test date< 1 year COA history 0% underdosed0% low purity 6 2
Lab evidence
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1421 MJR Co. Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-12Latest test date< 1 year COA history 0% underdosed0% low purity 7 1
Lab evidence
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1451 Moderne Apotheca (Guangzhou Pros Bio Tech) Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-12Latest test date< 1 year COA history 0% underdosed0% low purity 2 6
Lab evidence
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1432 Saratoga Health Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-04Latest test date< 1 year COA history 0% low purity 5 3
Lab evidence
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1435 Health Tides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-07-04Latest test date< 1 year COA history 0% underdosed0% low purity 4 4
Lab evidence
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1388 SHHI Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-25Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1389 Ethos Research Labs Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-23Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1427 Uwa Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-22Latest test date1+ year COA history 0% low purity 6 2
Lab evidence
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1390 BetaBioLabs Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-18Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1391 SILK SPICE Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-18Latest test date< 1 year COA history 100% low purity 8 0
Lab evidence
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1392 ETZ BIO Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-17Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1393 Bloom Aminos Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-15Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1394 Our Primal LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-14Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1395 TheaWell Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-12Latest test date< 1 year COA history 33% underdosed0% low purity 8 0
Lab evidence
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1396 Superior Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-09Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1397 PureForma Labz Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-07Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1436 Vital Club Research Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-07Latest test date< 1 year COA history 17% underdosed0% low purity 4 4
Lab evidence
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1398 Superb Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-06-04Latest test date< 1 year COA history 0% underdosed0% low purity 8 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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1399 Amino Reserve Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-31Latest test date< 1 year COA history 0% underdosed0% low purity 8 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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1400 Optimal Peptides (Opeptides) Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-30Latest test date< 1 year COA history 50% underdosed0% low purity 8 0
Lab evidence
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1433 Euno Labs Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-30Latest test date< 1 year COA history 0% underdosed0% low purity 5 3
Lab evidence
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1401 Solatide Biosciences Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-23Latest test date< 1 year COA history 0% underdosed0% low purity 8 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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1402 SLATE Research Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-22Latest test date< 1 year COA history 17% underdosed0% low purity 8 0
Lab evidence
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1403 The Peptide Bar Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 8 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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1445 RDAmd Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 3 5
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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1404 Apex Amino (BJ) Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-05-01Latest test date< 1 year COA history 0% underdosed0% low purity 8 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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1446 Nuvena Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-04-21Latest test date< 1 year COA history 0% underdosed0% low purity 3 5
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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1405 Planet Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-04-18Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1437 Molecular Standard LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-04-09Latest test date< 1 year COA history 12% underdosed0% low purity 4 4
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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1438 Tegrity Research Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-03-27Latest test date1+ year COA history 12% underdosed0% low purity 4 4
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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1422 LIMITLESS BIOCHEM Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-26Latest test date< 1 year COA history 12% underdosed0% low purity 7 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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1439 Reform Wellness Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-24Latest test date< 1 year COA history 0% low purity 4 4
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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1406 KenLuma Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-22Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1407 GXZ Peptides Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-16Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1408 SQRL Peptide Labs, LLC Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-11Latest test date< 1 year COA history 0% low purity 8 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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1409 Bio-Jacked Peps Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-04Latest test date< 1 year COA history 0% underdosed0% low purity 8 0
Lab evidence
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1410 Amino Market Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-03Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1411 Mindful Research Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-02-03Latest test date< 1 year COA history 0% low purity 8 0
Lab evidence
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1457 Vital Edge Science Explore test results Seller type not reviewed No buyer reviews indexed 8Unique reports 2026-01-26Latest test date1+ year COA history 0% underdosed0% low purity 0 8
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
- 121,185
- 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 · 7,735 unique reports · 20 observed in 30 days
- Compare manufacturers, exporters and other international sellers by their independent lab reports.
- Domestic resellers
- 102 reviewed vendors · 17,278 unique reports · 44 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 · 57,178 unique reports · 353 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 2026-10-27. 24 measured results have no usable date.
Domestic resellers: Recorded lab dates 2020-01-31 to 2026-10-27. 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 vendors1,792 measured results11.2–100% purity in 1,726 results Domestic resellers2,076 measured results33.7–100% purity in 1,924 results TirzepatideLab results by vendor↗ International vendors1,288 measured results40.4–100% purity in 1,254 results Domestic resellers1,438 measured results55.9–100% purity in 1,334 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 vendors403 measured results12.7–100% purity in 383 results Domestic resellers583 measured results48.94–99.99% purity in 526 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.