Overall findings
Most lab-test failures
Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
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966 Destination Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-30Latest test date< 1 year COA history 0% underdosed0% low purity 7 8
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975 Iron Era Labs Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-30Latest test date< 1 year COA history 0% underdosed0% low purity 3 12
Lab evidence
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952 Fortis Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-23Latest test date< 1 year COA history 0% underdosed0% low purity 11 4
Lab evidence
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968 Prisma Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-22Latest test date< 1 year COA history 0% underdosed0% low purity 6 9
Lab evidence
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979 Thornhill's Pharmacy Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-21Latest test date< 1 year COA history 0% underdosed0% low purity 1 14
Lab evidence
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920 Zhengzhou Depu Technology Co., Ltd Explore test results Seller type not reviewed 2 buyer reviews 15Unique reports 2026-08-19Latest test date1+ year COA history 0% low purity 15 0
Lab evidence
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958 PoppyPep Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-18Latest test date< 1 year COA history 0% underdosed0% low purity 9 6
Lab evidence
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95 Nu Lab Peptides Explore test results U.S. reseller No buyer reviews indexed 15Unique reports 2026-08-17Latest test date< 1 year COA history 0% underdosed0% low purity 13 2
Lab evidence
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977 DZ Systems Research Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-13Latest test date< 1 year COA history 0% underdosed0% low purity 2 13
Lab evidence
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970 TRE Ventures / Research Compounds Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-09Latest test date< 1 year COA history 10% underdosed0% low purity 5 10
Lab evidence
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973 Anvil Compounds Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-07Latest test date< 1 year COA history 0% low purity 4 11
Lab evidence
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967 Zennier Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-08-01Latest test date< 1 year COA history 40% underdosed7% low purity 7 8
Lab evidence
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921 boc-peptide Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-07-27Latest test date< 1 year COA history 10% underdosed0% low purity 15 0
Lab evidence
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943 Vida Research Group Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-07-22Latest test date< 1 year COA history 0% underdosed0% low purity 14 1
Lab evidence
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922 Y&P Labs Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-07-10Latest test date< 1 year COA history 0% underdosed0% low purity 15 0
Lab evidence
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953 Peptide Lab Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-07-10Latest test date< 1 year COA history 9% underdosed0% low purity 11 4
Lab evidence
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923 Trulife Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-07-01Latest test date< 1 year COA history 8% underdosed0% low purity 15 0
Lab evidence
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924 Sin City Science Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-28Latest test date< 1 year COA history 18% underdosed0% low purity 15 0
Lab evidence
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925 Elevatedsciencellc.com Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-25Latest test date< 1 year COA history 8% underdosed0% low purity 15 0
Lab evidence
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926 SIRIUX LABS Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-25Latest test date< 1 year COA history 0% underdosed0% low purity 15 0
Lab evidence
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927 Thekitqueens.com Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-25Latest test date< 1 year COA history 8% underdosed0% low purity 15 0
Lab evidence
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949 M.A.D. Amino Research Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-18Latest test date< 1 year COA history 0% underdosed0% low purity 12 3
Lab evidence
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928 Quorvex Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-15Latest test date< 1 year COA history 0% underdosed0% low purity 15 0
Lab evidence
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944 Olympic Peptide Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-06-11Latest test date1+ year COA history 17% underdosed8% low purity 14 1
Lab evidence
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929 Endura Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-28Latest test date< 1 year COA history 0% underdosed0% low purity 15 0
Lab evidence
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954 Summit Wellness Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-23Latest test date< 1 year COA history 0% underdosed0% low purity 11 4
Lab evidence
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959 Phoenix Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-22Latest test date1+ year COA history 0% low purity 9 6
Lab evidence
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946 Clinical Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-21Latest test date< 1 year COA history 0% underdosed0% low purity 13 2
Lab evidence
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91 NexxGen Peptides Explore test results U.S. reseller No buyer reviews indexed 15Unique reports 2026-05-20Latest test date< 1 year COA history 9% underdosed0% low purity 15 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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930 UAE Peptide Lab Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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960 Peptyx Labs Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-09Latest test date< 1 year COA history 0% underdosed0% low purity 9 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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931 PetBiologix Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-08Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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974 High Tide Compounds Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-08Latest test date< 1 year COA history 8% underdosed0% low purity 4 11
Lab evidence
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932 Nuway Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-05-04Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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933 Pure Tested Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-04-28Latest test date1+ year COA history 25% underdosed18% low purity 15 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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934 APR Health Solutions Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-04-26Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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964 RENU Wellness LLC Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-04-22Latest test date< 1 year COA history 0% low purity 8 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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965 New Era Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-04-19Latest test date< 1 year COA history 0% underdosed0% low purity 8 7
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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935 Bioryx Labs Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-04-15Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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950 Shilai Peptide Technologies Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-03-30Latest test date1+ year COA history 0% underdosed0% low purity 12 3
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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947 Brava Longevity Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-02-27Latest test date< 1 year COA history 0% underdosed0% low purity 13 2
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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961 SNP Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-02-26Latest test date1+ year COA history 0% underdosed0% low purity 9 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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936 Iron Within Nutrition LLC Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-02-22Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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951 Sj Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-01-26Latest test date2+ years COA history 8% low purity 12 3
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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94 Pure Health Peptides Explore test results U.S. reseller No buyer reviews indexed 15Unique reports 2026-01-13Latest test date< 1 year COA history 11% underdosed9% low purity 14 1
Lab evidence
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937 Peak Peptides Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2026-01-13Latest test date1+ year COA history 18% underdosed0% low purity 15 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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938 Felix Chem LLC Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2025-12-31Latest test date< 1 year COA history 0% underdosed0% low purity 15 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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92 Peptide Haven Explore test results U.S. reseller No buyer reviews indexed 15Unique reports 2025-12-02Latest test date1+ year COA history 0% underdosed0% low purity 15 0
Lab evidence
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955 Amino Alchemy Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2025-12-02Latest test date1+ year COA history Fewer than 5 applicable tests 11 4
Lab evidence
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939 NOVA Peptide Supply Explore test results Seller type not reviewed No buyer reviews indexed 15Unique reports 2025-11-22Latest test date< 1 year COA history 7% underdosed0% low purity 15 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
- 121,052
- 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.