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.
537 Dragon Pharma Explore test results Seller type not reviewed No buyer reviews indexed 28Unique reports 2025-09-15Latest test date4+ years COA history 6% underdosed17% low purity 1 27
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539 alansrylab Explore test results Seller type not reviewed No buyer reviews indexed 28Unique reports 2025-09-09Latest test date1+ year COA history 0% underdosed0% low purity 0 28
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553 Guangzhou Aoyu Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-10-20Latest test date< 1 year COA history 0% low purity 9 18
Lab evidence
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549 Platinum Lion Peptides Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-10-14Latest test date< 1 year COA history 0% underdosed0% low purity 15 12
Lab evidence
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548 Aavant Research Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-10-05Latest test date1+ year COA history 0% low purity 18 9
Lab evidence
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545 Kronos Peptides Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-10-01Latest test date< 1 year COA history 6% underdosed0% low purity 22 5
Lab evidence
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546 Finesse Biopep Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-09-19Latest test date< 1 year COA history 0% underdosed0% low purity 22 5
Lab evidence
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550 Guardian Global - Peptides Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-09-07Latest test date< 1 year COA history 0% underdosed0% low purity 13 14
Lab evidence
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543 FutureWell Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-09-02Latest test date1+ year COA history 0% underdosed0% low purity 24 3
Lab evidence
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554 Vytal Research Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-08-30Latest test date< 1 year COA history 0% underdosed0% low purity 7 20
Lab evidence
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555 Advanced Research Network Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-08-26Latest test date< 1 year COA history 11% underdosed0% low purity 1 26
Lab evidence
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552 Wolverine Peptides Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-08-25Latest test date2+ years COA history 5% underdosed0% low purity 12 15
Lab evidence
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540 MED — Shenzhen Maide Technology Explore test results Seller type not reviewed 1 buyer review 27Unique reports 2026-07-18Latest test date< 1 year COA history 0% underdosed9% low purity 27 0
Lab evidence
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541 Peptify Labs Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-06-21Latest test date< 1 year COA history 5% underdosed0% low purity 27 0
Lab evidence
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551 crystalpeptides.eu Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-06-04Latest test date< 1 year COA history 5% underdosed5% low purity 13 14
Lab evidence
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547 BioGenix Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-03-27Latest test date1+ year COA history 19% underdosed4% low purity 21 6
Lab evidence
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30 Forever Young Pharmacy Explore test results International vendor No buyer reviews indexed 27Unique reports 2026-03-03Latest test date1+ year COA history 9% low purity 26 1
Lab evidence
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542 Amino Quest Labs Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2026-02-27Latest test date< 1 year COA history 6% underdosed0% low purity 27 0
Lab evidence
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544 www.optimasupply.net Explore test results Seller type not reviewed No buyer reviews indexed 27Unique reports 2025-04-28Latest test date2+ years COA history Fewer than 5 applicable tests 24 3
Lab evidence
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575 Vital Research Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-10-19Latest test date< 1 year COA history 8% underdosed0% low purity 9 17
Lab evidence
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578 Apexx BioLabs LLC Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-10-19Latest test date< 1 year COA history 0% underdosed0% low purity 5 21
Lab evidence
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572 Centrion Labs Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-10-14Latest test date< 1 year COA history 5% underdosed0% low purity 13 13
Lab evidence
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566 White Market Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-10-02Latest test date< 1 year COA history 5% underdosed0% low purity 17 9
Lab evidence
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577 Rethel Jinan New Energy Technology Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-10-01Latest test date1+ year COA history 0% low purity 7 19
Lab evidence
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567 Peak Performance Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-09-29Latest test date< 1 year COA history 10% underdosed0% low purity 17 9
Lab evidence
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576 Stryvion Peptide Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-09-21Latest test date< 1 year COA history 0% underdosed0% low purity 8 18
Lab evidence
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579 Alera research Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-09-14Latest test date< 1 year COA history 5% underdosed0% low purity 4 22
Lab evidence
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573 Biochem API Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-09-01Latest test date< 1 year COA history 6% underdosed0% low purity 11 15
Lab evidence
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580 Pivot Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-08-15Latest test date< 1 year COA history 9% underdosed0% low purity 4 22
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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563 Satas Inc. / be.satas Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-08-12Latest test date< 1 year COA history 4% underdosed0% low purity 21 5
Lab evidence
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574 Optimum ReGen Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-08-11Latest test date< 1 year COA history 0% underdosed4% low purity 11 15
Lab evidence
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569 MitoBioLabs LLC Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-08-08Latest test date< 1 year COA history 6% underdosed0% low purity 15 11
Lab evidence
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85 Ion Peptides Explore test results U.S. reseller No buyer reviews indexed 26Unique reports 2026-07-30Latest test date1+ year COA history 5% underdosed4% low purity 25 1
Lab evidence
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564 BIOSIM Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-07-25Latest test date< 1 year COA history 0% underdosed0% low purity 20 6
Lab evidence
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562 Embody Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-07-14Latest test date< 1 year COA history 4% low purity 25 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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570 Peptide Membership Association Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-07-05Latest test date< 1 year COA history 12% underdosed5% low purity 15 11
Lab evidence
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556 Trinity Wellness Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-07-01Latest test date< 1 year COA history 8% underdosed0% low purity 26 0
Lab evidence
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565 Revival Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-07-01Latest test date< 1 year COA history 0% underdosed0% low purity 20 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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557 Protech Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-06-20Latest test date< 1 year COA history 5% underdosed0% low purity 26 0
Lab evidence
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558 Accelerate Labs Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-06-08Latest test date1+ year COA history 8% low purity 26 0
Lab evidence
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568 Aviva Amino LLC Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-06-01Latest test date< 1 year COA history 0% underdosed0% low purity 16 10
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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571 Prism Aminos Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-04-09Latest test date< 1 year COA history 4% underdosed4% low purity 15 11
Lab evidence
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559 Blank Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-04-07Latest test date< 1 year COA history 0% underdosed0% low purity 26 0
Lab evidence
Free previewExplore this vendor’s lab reports
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560 Molecular Edge Peptides Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2026-01-13Latest test date< 1 year COA history 0% underdosed0% low purity 26 0
Lab evidence
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561 Asteroid Biotech Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2025-10-21Latest test date2+ years COA history 40% low purity 26 0
Lab evidence
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581 odinlabs Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2024-08-13Latest test date2+ years COA history Fewer than 5 applicable tests 0 26
Lab evidence
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582 808labs Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2024-03-08Latest test date2+ years COA history 0% underdosed 0 26
Lab evidence
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583 Deus Pharmaceuticals Canada Explore test results Seller type not reviewed No buyer reviews indexed 26Unique reports 2023-08-30Latest test date5+ years COA history 25% low purity 0 26
Lab evidence
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604 LabRat Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 25Unique reports 2026-10-21Latest test date< 1 year COA history 0% underdosed0% low purity 6 19
Lab evidence
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608 Hong Kong Meiliduo Technology Limited Explore test results Seller type not reviewed No buyer reviews indexed 25Unique reports 2026-10-15Latest test date< 1 year COA history 10% low purity 0 25
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.