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.
775 Estera Labs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-08-03Latest test date< 1 year COA history 0% underdosed0% low purity 15 4
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777 CrimsonPeptide.com/CrimsonPeptide, LLC Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-07-31Latest test date< 1 year COA history 7% underdosed0% low purity 14 5
Lab evidence
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778 Iaso BioLabs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-07-21Latest test date< 1 year COA history 10% underdosed0% low purity 14 5
Lab evidence
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783 Zentra Compounds Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-07-20Latest test date< 1 year COA history 13% underdosed0% low purity 12 7
Lab evidence
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790 Stack One Labs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-07-08Latest test date< 1 year COA history 0% underdosed0% low purity 7 12
Lab evidence
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767 LT Peptides Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-07-01Latest test date< 1 year COA history 0% underdosed0% low purity 19 0
Lab evidence
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768 S.O.S. Labs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-06-09Latest test date< 1 year COA history 7% underdosed0% low purity 19 0
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769 Fountain of Youth Research Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-05-30Latest test date1+ year COA history 17% underdosed0% low purity 19 0
Lab evidence
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782 Tier1Peptides Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-05-01Latest test date< 1 year COA history 0% underdosed5% low purity 13 6
Lab evidence
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779 Elite Bio Research Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-04-06Latest test date< 1 year COA history 0% underdosed0% low purity 14 5
Lab evidence
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791 White Claw Labs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-02-26Latest test date< 1 year COA history 25% underdosed27% low purity 7 12
Lab evidence
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770 21 Peptide Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-02-24Latest test date< 1 year COA history 12% underdosed5% low purity 19 0
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771 Project Praxis Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2026-01-31Latest test date1+ year COA history 0% underdosed0% low purity 19 0
Lab evidence
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772 Momentum Research Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2025-07-03Latest test date1+ year COA history 6% underdosed0% low purity 19 0
Lab evidence
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773 Matrix Laboratories Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2025-04-03Latest test date1+ year COA history 0% underdosed 19 0
Lab evidence
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785 Aus Pharmacy Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2023-11-10Latest test date3+ years COA history Fewer than 5 applicable tests 9 10
Lab evidence
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797 BrainLabz.ru Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2023-09-07Latest test date3+ years COA history 65% low purity 0 19
Lab evidence
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798 Proper Labs Explore test results Seller type not reviewed No buyer reviews indexed 19Unique reports 2022-05-28Latest test date5+ years COA history 0% underdosed 0 19
Lab evidence
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831 Norco Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-21Latest test date< 1 year COA history 19% low purity 0 18
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813 Core Aminos Research Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-20Latest test date< 1 year COA history 6% underdosed0% low purity 14 4
Lab evidence
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819 Bopeptide Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-20Latest test date1+ year COA history 6% low purity 8 10
Lab evidence
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826 Pride Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-15Latest test date< 1 year COA history 7% underdosed0% low purity 4 14
Lab evidence
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820 Bio Jacked Supplements Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-13Latest test date< 1 year COA history 15% underdosed0% low purity 8 10
Lab evidence
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817 Alamo Research Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-10Latest test date< 1 year COA history 0% underdosed0% low purity 9 9
Lab evidence
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829 Vixenova Labs Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-10Latest test date< 1 year COA history 25% underdosed0% low purity 2 16
Lab evidence
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823 Tristar Peptides Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-10-03Latest test date< 1 year COA history 0% underdosed0% low purity 6 12
Lab evidence
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815 Advantogen Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-26Latest test date1+ year COA history 0% underdosed0% low purity 12 6
Lab evidence
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824 Avenio Bio LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-26Latest test date< 1 year COA history 6% underdosed0% low purity 5 13
Lab evidence
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818 Liyu Daily Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-24Latest test date1+ year COA history 14% underdosed6% low purity 9 9
Lab evidence
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821 Lisa Levy Living Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-05Latest test date< 1 year COA history 0% underdosed0% low purity 8 10
Lab evidence
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827 Hardnox Research Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-05Latest test date< 1 year COA history 0% underdosed0% low purity 4 14
Lab evidence
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830 ENDLESS LONGEVITY RESEARCH Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-03Latest test date< 1 year COA history 0% underdosed0% low purity 1 17
Lab evidence
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828 GROPPI AMERICAN PEPTIDES Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-09-01Latest test date< 1 year COA history 0% low purity 3 15
Lab evidence
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825 GLOW Research Society Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-08-30Latest test date< 1 year COA history 20% underdosed0% low purity 5 13
Lab evidence
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822 TNN Enterprises Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-08-28Latest test date< 1 year COA history 0% underdosed6% low purity 8 10
Lab evidence
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811 Healthtide Biotech Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-08-25Latest test date1+ year COA history 11% low purity 15 3
Lab evidence
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814 Nulife Peptides Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-08-12Latest test date< 1 year COA history 0% low purity 14 4
Lab evidence
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812 Direct Vision, LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-08-06Latest test date1+ year COA history 8% underdosed0% low purity 15 3
Lab evidence
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808 Huatai Peptides Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-07-31Latest test date< 1 year COA history 7% underdosed0% low purity 17 1
Lab evidence
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809 Titan Peptide Research Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-07-18Latest test date< 1 year COA history 0% underdosed0% low purity 17 1
Lab evidence
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810 Venom Lab Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-07-10Latest test date< 1 year COA history Fewer than 5 applicable tests 17 1
Lab evidence
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799 SYNRG Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-06-25Latest test date< 1 year COA history 6% underdosed0% low purity 18 0
Lab evidence
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800 A.R.N./Advanced Research Network Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-06-21Latest test date< 1 year COA history 0% underdosed0% low purity 18 0
Lab evidence
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816 Kensington labs Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-05-25Latest test date1+ year COA history 12% underdosed8% low purity 12 6
Lab evidence
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801 Paradigm Peptide Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-04-30Latest test date1+ year COA history 0% low purity 18 0
Lab evidence
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802 Intevera Health Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-01-18Latest test date1+ year COA history 0% underdosed0% low purity 18 0
Lab evidence
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803 BioThrive Research LLC Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2026-01-13Latest test date< 1 year COA history 7% underdosed0% low purity 18 0
Lab evidence
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804 Science Of Longevity Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2025-12-17Latest test date< 1 year COA history 7% low purity 18 0
Lab evidence
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805 Peptide Department Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2025-12-12Latest test date< 1 year COA history 0% underdosed0% low purity 18 0
Lab evidence
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832 opengatelabs.com Explore test results Seller type not reviewed No buyer reviews indexed 18Unique reports 2025-12-02Latest test date1+ year COA history Fewer than 5 applicable tests 0 18
Lab evidence
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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
- 121,045
- 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.