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.
79 MIX — Mix Peptides Explore test results Seller type not reviewed 5 buyer reviews 105Unique reports 2026-10-08Latest test date1+ year COA history 0% underdosed5% low purity 80 25
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78 SP Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-08-30Latest test date< 1 year COA history 8% underdosed0% low purity 83 22
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77 Jett Labs Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-08-26Latest test date1+ year COA history 4% underdosed1% low purity 85 20
Lab evidence
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27 WBS — Shanghai Wibson Biotechnology Wbs Explore test results International vendor 131 buyer reviews 104Unique reports 2026-10-20Latest test date1+ year COA history 0% underdosed4% low purity 57 47
Lab evidence
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81 RL Bioresearch LLC Explore test results Seller type not reviewed No buyer reviews indexed 104Unique reports 2026-10-16Latest test date< 1 year COA history 3% underdosed0% low purity 70 34
Lab evidence
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26 Shanghai Baoju Explore test results International vendor No buyer reviews indexed 104Unique reports 2026-09-24Latest test date1+ year COA history 3% low purity 85 19
Lab evidence
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82 Molecular Solutions Peptides Explore test results Seller type not reviewed No buyer reviews indexed 103Unique reports 2026-10-08Latest test date1+ year COA history 4% underdosed0% low purity 66 37
Lab evidence
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28 MandyBio Explore test results International vendor No buyer reviews indexed 103Unique reports 2026-08-05Latest test date1+ year COA history 2% underdosed8% low purity1 endotoxin failure 97 6
Lab evidence
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85 PeptideRUO LLC Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-10-15Latest test date1+ year COA history 4% underdosed1% low purity 43 59
Lab evidence
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84 Underground Pharm Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-09-29Latest test date1+ year COA history 4% underdosed0% low purity 66 36
Lab evidence
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83 aura Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-07-21Latest test date1+ year COA history 3% underdosed3% low purity 98 4
Lab evidence
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86 Unique Pharmaceutical Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-07-16Latest test date4+ years COA history 13% underdosed 35 67
Lab evidence
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88 Novapeptide Explore test results Seller type not reviewed No buyer reviews indexed 101Unique reports 2026-10-20Latest test date< 1 year COA history 5% underdosed2% low purity 7 94
Lab evidence
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87 Formera Research Explore test results Seller type not reviewed No buyer reviews indexed 101Unique reports 2026-09-10Latest test date< 1 year COA history 5% underdosed3% low purity 84 17
Lab evidence
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92 Authentichain Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-10-16Latest test date< 1 year COA history 12% underdosed0% low purity 29 71
Lab evidence
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89 BioVitalis Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-10-08Latest test date< 1 year COA history 7% underdosed0% low purity 63 37
Lab evidence
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90 JTP — Just The Product Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-09-29Latest test date1+ year COA history 0% underdosed0% low purity 62 38
Lab evidence
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91 Bio Health Peptides Proteins Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-09-29Latest test date< 1 year COA history 1% underdosed0% low purity 49 51
Lab evidence
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94 Stemalia Explore test results Seller type not reviewed No buyer reviews indexed 99Unique reports 2026-10-10Latest test date< 1 year COA history 4% underdosed0% low purity 62 37
Lab evidence
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93 US Peptide Co Explore test results Seller type not reviewed No buyer reviews indexed 99Unique reports 2026-06-27Latest test date1+ year COA history 8% underdosed0% low purity 99 0
Lab evidence
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96 Ascend Amino Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-20Latest test date4+ years COA history 4% underdosed0% low purity 69 29
Lab evidence
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99 Umbrella Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-14Latest test date2+ years COA history 15% underdosed0% low purity 15 83
Lab evidence
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98 Henan Sahe Peptide Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-09Latest test date1+ year COA history 5% low purity 45 53
Lab evidence
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97 Amino USA Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-09-10Latest test date1+ year COA history 5% underdosed2% low purity 66 32
Lab evidence
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95 Modern Research Peptides Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-05-04Latest test date1+ year COA history 2% underdosed0% low purity 97 1
Lab evidence
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100 Dankang Biohealth Explore test results Seller type not reviewed No buyer reviews indexed 97Unique reports 2026-10-20Latest test date< 1 year COA history 4% low purity 69 28
Lab evidence
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50 Prime Peptides Explore test results U.S. reseller No buyer reviews indexed 97Unique reports 2026-10-17Latest test date2+ years COA history 0% underdosed1% low purity 49 48
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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101 Ascend Nutrition LLC Explore test results Seller type not reviewed No buyer reviews indexed 97Unique reports 2026-10-09Latest test date1+ year COA history 12% underdosed0% low purity 57 40
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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102 Peptide Maxxing Explore test results Seller type not reviewed No buyer reviews indexed 97Unique reports 2026-10-02Latest test date< 1 year COA history 8% underdosed0% low purity 25 72
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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49 LA Peptides Explore test results U.S. reseller No buyer reviews indexed 97Unique reports 2026-02-14Latest test date1+ year COA history 5% underdosed1% low purity 97 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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105 Rogue Valley Peptides Explore test results Seller type not reviewed No buyer reviews indexed 96Unique reports 2026-10-08Latest test date1+ year COA history 3% underdosed1% low purity 54 42
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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51 Alpha Peptides Explore test results U.S. reseller No buyer reviews indexed 96Unique reports 2026-09-23Latest test date1+ year COA history 7% underdosed0% low purity 57 39
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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104 Great Northern Peptides Explore test results Seller type not reviewed No buyer reviews indexed 96Unique reports 2026-08-30Latest test date1+ year COA history 5% underdosed0% low purity 83 13
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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103 VPeptide Explore test results Seller type not reviewed No buyer reviews indexed 96Unique reports 2026-08-24Latest test date1+ year COA history 0% underdosed0% low purity 96 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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106 ZJ — Zenith Jove Peptide Zj Explore test results Seller type not reviewed 3 buyer reviews 95Unique reports 2026-10-06Latest test date< 1 year COA history 1% low purity 65 30
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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107 MetBio Peptides Explore test results Seller type not reviewed No buyer reviews indexed 95Unique reports 2026-09-26Latest test date< 1 year COA history 9% underdosed1% low purity 28 67
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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109 Fit Aminos Explore test results Seller type not reviewed No buyer reviews indexed 94Unique reports 2026-09-06Latest test date1+ year COA history 3% underdosed0% low purity 78 16
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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108 BTS Explore test results Seller type not reviewed No buyer reviews indexed 94Unique reports 2026-06-27Latest test date< 1 year COA history 0% underdosed0% low purity 94 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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113 Shanghai Leader Peptide Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 93Unique reports 2026-10-09Latest test date< 1 year COA history 0% underdosed5% low purity 57 36
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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114 Purity Analytics Explore test results Seller type not reviewed No buyer reviews indexed 93Unique reports 2026-08-26Latest test date< 1 year COA history 1% underdosed0% low purity 36 57
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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110 National Science Labs, LLC Explore test results Seller type not reviewed No buyer reviews indexed 93Unique reports 2026-08-21Latest test date< 1 year COA history 8% underdosed1% low purity 93 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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112 XDR — Xingruida Xdr Explore test results Seller type not reviewed No buyer reviews indexed 93Unique reports 2026-08-12Latest test date1+ year COA history 2% low purity 74 19
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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111 Cerberus Research Explore test results Seller type not reviewed No buyer reviews indexed 93Unique reports 2026-03-25Latest test date1+ year COA history 5% underdosed0% low purity 76 17
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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117 Northwest Peptides Explore test results Seller type not reviewed No buyer reviews indexed 92Unique reports 2026-10-02Latest test date< 1 year COA history 0% underdosed0% low purity 70 22
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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116 Welli Labs Explore test results Seller type not reviewed No buyer reviews indexed 92Unique reports 2026-06-22Latest test date1+ year COA history 8% underdosed4% low purity 88 4
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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115 Upgrade Wellness Explore test results Seller type not reviewed No buyer reviews indexed 92Unique reports 2026-02-14Latest test date1+ year COA history 10% underdosed0% low purity 92 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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120 Precision Research Explore test results Seller type not reviewed No buyer reviews indexed 91Unique reports 2026-10-10Latest test date< 1 year COA history 3% underdosed0% low purity 58 33
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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121 Pepgenix Peptides Explore test results Seller type not reviewed No buyer reviews indexed 91Unique reports 2026-09-23Latest test date1+ year COA history 5% underdosed2% low purity 49 42
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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119 Popular Peptides Explore test results Seller type not reviewed No buyer reviews indexed 91Unique reports 2026-08-28Latest test date1+ year COA history 4% underdosed0% low purity 69 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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118 Opal Peptides Explore test results Seller type not reviewed No buyer reviews indexed 91Unique reports 2026-07-03Latest test date< 1 year COA history 8% underdosed0% low purity 80 11
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
- 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.