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.
687 Trident Aminos Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2026-02-16Latest test date< 1 year COA history 0% underdosed0% low purity 22 0
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688 Vandl Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2026-02-14Latest test date1+ year COA history 0% underdosed0% low purity 22 0
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689 Nexus Synth Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2025-12-29Latest test date1+ year COA history 0% underdosed5% low purity 22 0
Lab evidence
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693 Pharma Grade Peptides Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2025-10-12Latest test date1+ year COA history 9% low purity 18 4
Lab evidence
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690 Arailpharma Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2025-06-10Latest test date2+ years COA history 11% underdosed 22 0
Lab evidence
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706 ANABOLEX Explore test results Seller type not reviewed No buyer reviews indexed 22Unique reports 2023-12-29Latest test date2+ years COA history Fewer than 5 applicable tests 0 22
Lab evidence
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721 RLP Bio Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-10-10Latest test date< 1 year COA history 0% underdosed0% low purity 15 6
Lab evidence
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725 Empire Compounds Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-10-07Latest test date< 1 year COA history 0% underdosed0% low purity 8 13
Lab evidence
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731 Empire Peptides Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-10-06Latest test date< 1 year COA history 0% underdosed0% low purity 3 18
Lab evidence
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722 Pepolution Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-27Latest test date1+ year COA history 0% underdosed0% low purity 14 7
Lab evidence
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726 Yidan Biotech Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-24Latest test date< 1 year COA history 0% low purity 8 13
Lab evidence
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729 KellsX Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-19Latest test date< 1 year COA history 12% underdosed0% low purity 5 16
Lab evidence
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716 Anlv Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-15Latest test date1+ year COA history 5% low purity 19 2
Lab evidence
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727 Cellipep/Cardonix Labs Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-11Latest test date< 1 year COA history 6% underdosed0% low purity 8 13
Lab evidence
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719 ezPeps - Quality Research Peptides Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-09-03Latest test date< 1 year COA history 0% underdosed0% low purity 16 5
Lab evidence
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723 True Form Peptides Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-08-12Latest test date< 1 year COA history 0% underdosed0% low purity 14 7
Lab evidence
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724 Alpha Aminos Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-08-07Latest test date< 1 year COA history 0% underdosed0% low purity 12 9
Lab evidence
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720 Greatest Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-08-05Latest test date< 1 year COA history 0% underdosed0% low purity 16 5
Lab evidence
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715 Optimized Aminos Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-07-24Latest test date< 1 year COA history 0% underdosed5% low purity 20 1
Lab evidence
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707 Kerisite Shenzhen International Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-05-15Latest test date1+ year COA history 0% low purity 21 0
Lab evidence
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708 Eternal Aminos Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-04-14Latest test date1+ year COA history 0% underdosed5% low purity 21 0
Lab evidence
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709 Gogh Gear Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-04-09Latest test date1+ year COA history 0% underdosed0% low purity 21 0
Lab evidence
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717 Regenix Research Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-04-03Latest test date< 1 year COA history 33% underdosed0% low purity 17 4
Lab evidence
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710 Inspired Biogenics Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-04-01Latest test date< 1 year COA history 6% underdosed0% low purity 21 0
Lab evidence
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728 The Peptide Source Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-03-26Latest test date1+ year COA history 0% underdosed0% low purity 8 13
Lab evidence
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711 4 Pillar Labs Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-02-28Latest test date< 1 year COA history 12% underdosed0% low purity 21 0
Lab evidence
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712 Supergenix Labs Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2026-02-22Latest test date< 1 year COA history 17% underdosed0% low purity 21 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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713 Precision Peptide Co Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2025-10-23Latest test date1+ year COA history 0% low purity 21 0
Lab evidence
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714 Peptides 4 Research Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2025-05-21Latest test date1+ year COA history 0% low purity 21 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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718 AstropeptidesUSA Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2025-05-02Latest test date2+ years COA history 0% low purity 17 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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730 ExpressPCT Explore test results Seller type not reviewed No buyer reviews indexed 21Unique reports 2024-08-21Latest test date6+ years COA history 15% underdosed 4 17
Lab evidence
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751 Exogenics Lab Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-10-19Latest test date< 1 year COA history 0% underdosed0% low purity 12 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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763 STX Research Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-10-15Latest test date< 1 year COA history 0% underdosed0% low purity 1 19
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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761 Protocol No.9 Peptides Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-10-12Latest test date< 1 year COA history 0% underdosed0% low purity 6 14
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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742 Cryocore Performance Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-10-05Latest test date< 1 year COA history 7% underdosed0% low purity 15 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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756 Peptiatlas Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-10-01Latest test date1+ year COA history 17% underdosed6% low purity 9 11
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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764 Expert Peptide Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-30Latest test date< 1 year COA history 0% low purity 0 20
Lab evidence
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753 BlueStar Peptides Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-29Latest test date< 1 year COA history 0% underdosed0% low purity 11 9
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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757 Guangzhou Lengiuanhuang Cosmetics Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-24Latest test date< 1 year COA history 8% low purity 9 11
Lab evidence
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754 Tahoe Elite Research Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-18Latest test date< 1 year COA history 7% underdosed0% low purity 11 9
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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740 Pureveda Peptides Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-16Latest test date1+ year COA history 0% underdosed0% low purity 16 4
Lab evidence
Free previewExplore this vendor’s lab reports
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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741 Amino-Me Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-15Latest test date< 1 year COA history 5% underdosed0% low purity 16 4
Lab evidence
Free previewExplore this vendor’s lab reports
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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758 Native Peptides Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-10Latest test date< 1 year COA history 7% underdosed0% low purity 9 11
Lab evidence
Free previewExplore this vendor’s lab reports
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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762 BetterBio Synthesis Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-10Latest test date< 1 year COA history 0% underdosed0% low purity 6 14
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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747 Elite Eons Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-09Latest test date< 1 year COA history 0% underdosed0% low purity 13 7
Lab evidence
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748 Alchemy Peptide Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-09-03Latest test date< 1 year COA history 0% underdosed0% low purity 13 7
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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759 C-Pep Research Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-08-13Latest test date< 1 year COA history 6% underdosed0% low purity 9 11
Lab evidence
Free previewExplore this vendor’s lab reports
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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744 Truline Medical Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-08-12Latest test date< 1 year COA history 0% underdosed0% low purity 14 6
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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749 Hydra Pulse Research Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-08-06Latest test date< 1 year COA history 0% underdosed0% low purity 13 7
Lab evidence
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752 Peptidologix Explore test results Seller type not reviewed No buyer reviews indexed 20Unique reports 2026-07-21Latest test date< 1 year COA history 6% underdosed0% low purity 12 8
Lab evidence
Free previewExplore this vendor’s lab reports
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 · 38 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 · 344 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.