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50 PeptideSupplyCo.com Explore test results Seller type not reviewed No buyer reviews indexed 150Unique reports 2026-10-16Latest test date< 1 year COA history 4% underdosed0% low purity 82 68
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35 Oros Research Explore test results U.S. reseller No buyer reviews indexed 150Unique reports 2026-03-10Latest test date1+ year COA history 2% underdosed0% low purity 148 2
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49 Peptide Technologies Explore test results Seller type not reviewed No buyer reviews indexed 150Unique reports 2026-02-01Latest test date1+ year COA history 1% underdosed2% low purity 150 0
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36 Chameleon Peptides Explore test results U.S. reseller No buyer reviews indexed 149Unique reports 2026-09-06Latest test date< 1 year COA history 15% underdosed2% low purity 117 32
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37 Peptide Partners Explore test results U.S. reseller No buyer reviews indexed 147Unique reports 2026-10-20Latest test date1+ year COA history 7% underdosed2% low purity 115 32
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19 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 147Unique reports 2026-09-04Latest test date1+ year COA history 3% low purity1 endotoxin failure 139 8
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20 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 146Unique reports 2026-10-09Latest test date1+ year COA history 6% low purity 115 31
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51 AMO — Bfflist Amo Explore test results Seller type not reviewed 6 buyer reviews 146Unique reports 2026-10-06Latest test date1+ year COA history 3% underdosed0% low purity4 endotoxin failures 83 63
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52 True Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 145Unique reports 2026-10-16Latest test date1+ year COA history 9% underdosed2% low purity 103 42
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53 Grey Market Peptides Explore test results Seller type not reviewed No buyer reviews indexed 143Unique reports 2026-03-13Latest test date< 1 year COA history 12% underdosed1% low purity 143 0
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39 Nuscience Peptides Explore test results U.S. reseller No buyer reviews indexed 141Unique reports 2026-10-09Latest test date1+ year COA history 4% underdosed8% low purity 115 26
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38 Simple Peptides Explore test results U.S. reseller No buyer reviews indexed 141Unique reports 2025-11-16Latest test date1+ year COA history 12% underdosed5% low purity 141 0
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54 AMC Essentials Explore test results Seller type not reviewed No buyer reviews indexed 140Unique reports 2026-08-15Latest test date1+ year COA history 9% underdosed2% low purity 136 4
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55 Como Peptides Explore test results Seller type not reviewed No buyer reviews indexed 139Unique reports 2026-10-18Latest test date< 1 year COA history 6% underdosed1% low purity 66 73
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56 Affordable Peptides Explore test results Seller type not reviewed No buyer reviews indexed 137Unique reports 2026-10-20Latest test date< 1 year COA history 5% underdosed0% low purity 65 72
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58 Zenith Biopeptides Explore test results Seller type not reviewed No buyer reviews indexed 134Unique reports 2026-10-19Latest test date1+ year COA history 1% underdosed2% low purity 100 34
Lab evidence
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59 Nova Peptides Explore test results Seller type not reviewed No buyer reviews indexed 134Unique reports 2026-10-10Latest test date< 1 year COA history 4% underdosed2% low purity 86 48
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57 APS — Andy Peps Studio Explore test results Seller type not reviewed 13 buyer reviews 134Unique reports 2026-10-06Latest test date1+ year COA history 4% underdosed0% low purity 108 26
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60 Kalyx labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 133Unique reports 2026-10-17Latest test date< 1 year COA history 1% underdosed0% low purity 69 64
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40 Liberty Peptides Explore test results U.S. reseller No buyer reviews indexed 133Unique reports 2026-10-15Latest test date1+ year COA history 13% underdosed7% low purity 132 1
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61 Yimei Explore test results Seller type not reviewed No buyer reviews indexed 132Unique reports 2026-10-20Latest test date1+ year COA history 5% low purity 109 23
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21 Cocer Peptides Explore test results International vendor 126 buyer reviews 132Unique reports 2026-09-30Latest test date1+ year COA history 0% underdosed0% low purity 88 44
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62 Jade Nexus Explore test results Seller type not reviewed No buyer reviews indexed 130Unique reports 2026-10-21Latest test date1+ year COA history 9% underdosed3% low purity 88 42
Lab evidence
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42 Peptira Explore test results U.S. reseller No buyer reviews indexed 129Unique reports 2026-09-16Latest test date1+ year COA history 1% underdosed1% low purity 61 68
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43 Eternal Peptides Explore test results U.S. reseller No buyer reviews indexed 129Unique reports 2026-09-15Latest test date1+ year COA history 10% underdosed2% low purity 26 103
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41 Instant Peptides Explore test results U.S. reseller No buyer reviews indexed 129Unique reports 2026-06-12Latest test date1+ year COA history 1% underdosed2% low purity 127 2
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64 Lumira Explore test results Seller type not reviewed No buyer reviews indexed 128Unique reports 2026-10-20Latest test date< 1 year COA history 12% underdosed6% low purity1 endotoxin failure 48 80
Lab evidence
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63 Nutrastrips Explore test results Seller type not reviewed No buyer reviews indexed 128Unique reports 2026-10-16Latest test date1+ year COA history 2% low purity 81 47
Lab evidence
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22 BBA Peptides Explore test results International vendor 1 buyer review 127Unique reports 2026-08-21Latest test date1+ year COA history 16% underdosed3% low purity 99 28
Lab evidence
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44 Genpeptide Explore test results U.S. reseller No buyer reviews indexed 124Unique reports 2026-09-24Latest test date< 1 year COA history 1% underdosed0% low purity 96 28
Lab evidence
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66 TrueLab Peptides Explore test results Seller type not reviewed No buyer reviews indexed 123Unique reports 2026-10-16Latest test date< 1 year COA history 1% underdosed0% low purity 75 48
Lab evidence
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45 Rocky Mountain Compounds Explore test results U.S. reseller No buyer reviews indexed 123Unique reports 2026-10-07Latest test date< 1 year COA history 5% underdosed0% low purity 46 77
Lab evidence
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65 Mai Peptide Explore test results Seller type not reviewed No buyer reviews indexed 123Unique reports 2026-10-06Latest test date1+ year COA history 7% low purity 76 47
Lab evidence
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67 EZP Explore test results Seller type not reviewed No buyer reviews indexed 122Unique reports 2026-03-27Latest test date1+ year COA history 1% underdosed0% low purity 3 119
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46 Paramount Peptides Explore test results U.S. reseller No buyer reviews indexed 122Unique reports 2026-02-02Latest test date1+ year COA history 2% low purity 122 0
Lab evidence
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47 Kimera Chems Explore test results U.S. reseller No buyer reviews indexed 121Unique reports 2026-05-18Latest test date1+ year COA history 7% underdosed2% low purity 121 0
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23 HYB — Hangzhou Youngpeptide Biotechnology Hyb Explore test results International vendor 10 buyer reviews 118Unique reports 2026-09-30Latest test date2+ years COA history 3% underdosed9% low purity 49 69
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69 Aminos Research Explore test results Seller type not reviewed No buyer reviews indexed 117Unique reports 2026-04-28Latest test date3+ years COA history 1% low purity 7 110
Lab evidence
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68 P4R Wholesale, LLC Explore test results Seller type not reviewed No buyer reviews indexed 117Unique reports 2026-03-12Latest test date1+ year COA history 11% underdosed5% low purity 116 1
Lab evidence
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70 Good Looks Plus Shenanigans Explore test results Seller type not reviewed No buyer reviews indexed 116Unique reports 2026-10-14Latest test date< 1 year COA history 7% underdosed2% low purity 65 51
Lab evidence
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71 Happy Peps Explore test results Seller type not reviewed No buyer reviews indexed 116Unique reports 2026-10-08Latest test date1+ year COA history 2% underdosed1% low purity 60 56
Lab evidence
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72 Prime Longevity Peptides Explore test results Seller type not reviewed No buyer reviews indexed 114Unique reports 2026-09-26Latest test date< 1 year COA history 6% underdosed2% low purity 80 34
Lab evidence
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24 MKM — MKM Peptides Explore test results International vendor No buyer reviews indexed 112Unique reports 2026-10-20Latest test date1+ year COA history 5% underdosed8% low purity 74 38
Lab evidence
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25 PPHK — Peptide Pole HongKong Explore test results International vendor 215 buyer reviews 110Unique reports 2026-09-25Latest test date< 1 year COA history 0% underdosed1% low purity2 endotoxin failures 83 27
Lab evidence
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76 Ramp Peptides Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-10-15Latest test date< 1 year COA history 3% underdosed0% low purity 37 70
Lab evidence
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75 Zepeptide Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-10-14Latest test date< 1 year COA history 4% low purity1 endotoxin failure 52 55
Lab evidence
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74 Ozarks Research Cache LLC Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-09-18Latest test date< 1 year COA history 2% underdosed0% low purity 53 54
Lab evidence
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73 DSP Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-06-29Latest test date1+ year COA history 29% underdosed1% low purity 107 0
Lab evidence
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48 NuraPeptide Explore test results U.S. reseller No buyer reviews indexed 106Unique reports 2026-09-24Latest test date1+ year COA history 2% underdosed1% low purity 89 17
Lab evidence
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80 LP Peptide Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-10-20Latest test date< 1 year COA history 6% underdosed3% low purity 4 101
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
- 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.