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.
2284 LivWellX LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-25Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
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2285 Iron Bio Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest 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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2286 Look Max Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2287 Shanghai ERP Biology Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2288 ZHM Peptides Co. LTD. Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2468 BRUS LABS Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2469 Precision Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-24Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2289 liliPetide Technology Co., Ltd. Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-23Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2470 NorCal Aminos Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-23Latest test date< 1 year COA history Fewer than 5 applicable tests 1 1
Lab evidence
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2290 CompoundPpeptide Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2291 Gold Standard Bio Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2292 M&D Peps Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2293 OptiFormCompounds.com Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2294 The Peptide Mart Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2295 True Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-22Latest test date1+ year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2296 Vortex Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-20Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2297 Reta Research LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-18Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2298 Azul Aesthetics & Wellness, LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-17Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2299 ILLIUM LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-17Latest 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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2300 Whole Sale Peptide Supply Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-17Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2499 Hangzhou Go Top Peptide Biotech Gt Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-17Latest test date< 1 year COA history Fewer than 5 applicable tests 0 2
Lab evidence
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2301 BTXELITE / HGP Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-15Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2302 CASF Technologies Inc Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2303 Mearls Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2304 Revelation Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-14Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2305 Modern Apotheca (Guangzhou Pros Bio) Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-13Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2306 Modern Apothecary (TP Peptide) Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-13Latest 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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2307 Magnolia Peptide Company Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-12Latest 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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2308 Merc Chem Research (mercchem.com) Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-12Latest 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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2309 Preptide Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-12Latest 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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2310 Prime Sequence Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-12Latest 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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2311 AminoHelix Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-11Latest 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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2312 Black Gold Research LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-11Latest 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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2313 Crossroads Lab Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-10Latest 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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2314 Altitude Aminos Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2315 Glowy Peps Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2316 Hyperion Laboratories Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2317 Peptide.Mom Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2318 Sync Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2319 Z Peps Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-09Latest 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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2320 AminoPlex Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-08Latest 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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2321 Global Help LLC Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-08Latest 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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2322 Snowchelle Pepresearch Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-07Latest 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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2500 Nxir Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-06Latest 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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2323 Guangzhou Wandai Biotechnology Co., Ltd. Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-05Latest 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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2324 Medicalflow Global Development Limited Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-05Latest test date< 1 year COA history Fewer than 5 applicable tests 2 0
Lab evidence
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2325 Never Enough Labs Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-05Latest 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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2326 256 Peptides Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-04Latest 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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2327 Pep Rally Research Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-04Latest 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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2328 Peprally Solutions Explore test results Seller type not reviewed No buyer reviews indexed 2Unique reports 2026-06-03Latest 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
- 121,020
- 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.