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.
2880 prototypepeptide.is Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-07-08Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
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2881 Fenrir Labs Uk LTD Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-07-07Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
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2882 Www.Anglopeptides.co.uk Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-07-07Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2827 Biochainvault Peptides Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-07-04Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2828 CZ Biotec, LLC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-25Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2829 SA Inc. Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-25Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2830 Tankstar Research Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-25Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
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2831 Aks Chem Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-20Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2832 Hazel Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-13Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2833 NXT GEN PHARMCHEM Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-06-05Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
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2883 TEAM ANABOLIC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-21Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
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2884 Tex's Peps Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-16Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2885 www.qingshangmao.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-15Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2886 ZYH Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-07Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2834 Peptide Worldwide Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-06Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2887 CinnaTropin Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-05-06Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2835 Oceania Capital Holdings, LLC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-29Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2888 www.oupeptido.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-28Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2889 www.oupeptied.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-28Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2890 www.reliablefillers.co.uk Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-28Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2891 STERoidify Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-24Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2836 Truetide Labs, a LuvionBio Subsidiary Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-22Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2892 Ignition Chems Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-17Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2893 https://zurichech.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-04-01Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2894 elxserpeptides.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-03-13Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2895 oxodua lab Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-03-12Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2837 www.wibson.com.cn Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-02-27Latest test date1+ year COA history Fewer than 5 applicable tests 1 0
Lab evidence
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2896 SEMAGENEX.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-02-04Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2897 www.ywaozo.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2025-01-24Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2898 https://pctzone.ru Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-11-15Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2899 curiouschems.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-11-08Latest test date1+ year COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2900 BiopPep LLC Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-10-16Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2901 NOVO-PHARM Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-10-15Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2902 Goruite Biotechnology Co Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-10-07Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2903 Vivan Pharmaceuticals Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-26Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2904 CELON LABORATORIES PVT. LTD. Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-14Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2905 Zydus Lifesciences Limited Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-14Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2906 AMO Peptide / AMO Pure Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-12Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2907 amopeptide Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-02Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2908 NORTH GEAR Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-08-02Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2909 Shanghai Nexa Pharma Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-07-24Latest test date2+ years 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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2910 Wuhan Bio Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-07-12Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2911 Shanghai ZYH Biotechnology Co.,Ltd. Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-07-03Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2912 Wuhan INNO Technology Co.,Ltd Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-07-03Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2913 Zhuzhou Lusong Zhongtuo Chemical Technology City Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-06-27Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2914 PENDER Chemscience Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-06-25Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2915 Optima Chemical Supply Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-06-03Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2916 Guruite Biotech Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-05-29Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2917 PekCura Labs Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-05-17Latest test date2+ years COA history Fewer than 5 applicable tests 0 1
Lab evidence
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2918 www.aminohq.com Explore test results Seller type not reviewed No buyer reviews indexed 1Unique reports 2024-05-06Latest test date2+ years 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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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
- 120,981
- 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 · 17,266 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 · 57,122 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.