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Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
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2436 Bridge Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-08-15Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
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2437 Powell Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-08-05Latest test date1+ 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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2438 E&D Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-08-01Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2439 Vitology Med LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-08-01Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2440 Writer Pro LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-07-25Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2441 SZJP (Phil C) Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-07-18Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2512 www.gpcrrms.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-07-10Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
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2513 https://www.lilipetide.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-07-08Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2514 BioGyrx Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-06-13Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2442 CWP Inc Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-05-28Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2443 Solaris Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-05-26Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
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2515 bosetech-chem.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-05-05Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2516 Sven Pharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-02-12Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2484 Healing Pharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-02-07Latest test date3+ years COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2517 Yiwu Aozuo Trading Firm Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2025-01-24Latest test date1+ year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2518 Selliza Pharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-10-08Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2519 Goruite Biotech Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-10-07Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2520 www.somatropin.shop Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-08-29Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2521 SEMTEX GENETICS Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-08-28Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2522 HAB PHARMACEUTICALS & RESEARCH LIMITED Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-08-21Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2523 Biogyra Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-08-19Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2444 BioPeptideX Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-08-12Latest test date2+ years COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2524 Asclepius.bio Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-07-10Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2525 EuroMed Pharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-06-17Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2526 BIONIZE PHARMATECH LTD. Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-06-16Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2527 ClearPeptides.Net Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-05-06Latest test date2+ years COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2528 Aurum Pharmacueticals Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-05-02Latest 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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2445 TDP Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-04-08Latest test date2+ years 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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2529 ybycusa.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2024-04-05Latest 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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2530 Exopharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2023-10-12Latest test date3+ 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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2531 WWW.HYGETROPIN.COM.CN Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2023-08-03Latest test date3+ 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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2532 Diamond Pharma Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2023-02-09Latest test date3+ 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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2533 XT LABS Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2023-02-09Latest test date3+ 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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2534 SB LABS Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2022-11-17Latest test date4+ 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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2535 Bonvari Laboratories Ltd Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2022-01-07Latest test date4+ 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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2536 SignalynBio Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-10-13Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2838 Auro Biopeptide Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-10-03Latest test date< 1 year COA history Fewer than 5 applicable tests 0 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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2839 American Peptides Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-09-30Latest test date< 1 year COA history Fewer than 5 applicable tests 0 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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2840 Claripeptide Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-09-15Latest test date< 1 year COA history Fewer than 5 applicable tests 0 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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2841 Helix Core Labs Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-08-12Latest test date< 1 year COA history Fewer than 5 applicable tests 0 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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2537 Biotopep Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-08-03Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2842 Peptide Shop Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-08-02Latest test date< 1 year COA history Fewer than 5 applicable tests 0 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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2538 Northern Border Health Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-03Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2539 Wasatch Research Labs Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-03Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2540 LSM Peps Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-02Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2541 Smooth N' Go, LLC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-02Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2542 AVANT AMINOS Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2543 B-Good Bio Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2544 Golden Standard LLC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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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2545 Miamichem Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 0
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
- 121,020
- 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 · 17,264 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 · 57,121 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.