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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52 Puratek Peptides Explore test results U.S. reseller No buyer reviews indexed 91Unique reports 2026-06-04Latest test date< 1 year COA history 1% underdosed0% low purity 81 10
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122 CHP — Champion Peptide Explore test results Seller type not reviewed 154 buyer reviews 90Unique reports 2026-10-14Latest test date1+ year COA history 0% underdosed1% low purity 80 10
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123 JHBiosciences Explore test results Seller type not reviewed No buyer reviews indexed 90Unique reports 2026-10-10Latest test date1+ year COA history 6% underdosed1% low purity 64 26
Lab evidence
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54 Tydes Explore test results U.S. reseller No buyer reviews indexed 90Unique reports 2026-09-16Latest test date2+ years COA history 3% underdosed3% low purity 62 28
Lab evidence
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53 Midwest Peptide Explore test results U.S. reseller No buyer reviews indexed 90Unique reports 2026-08-24Latest test date< 1 year COA history 4% underdosed0% low purity 70 20
Lab evidence
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128 ResearchPeps Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-10-09Latest test date4+ years COA history 0% underdosed0% low purity 51 38
Lab evidence
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125 Shandong Aishi Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-10-05Latest test date1+ year COA history 2% low purity 74 15
Lab evidence
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130 Pacific Edge Labs Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-09-21Latest test date< 1 year COA history 1% underdosed0% low purity 41 48
Lab evidence
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129 PurgoLabs LLC Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-09-13Latest test date< 1 year COA history 3% underdosed0% low purity 48 41
Lab evidence
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126 MagnumBio Health & Wellness Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-09-07Latest test date< 1 year COA history 7% underdosed0% low purity 71 18
Lab evidence
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127 thelobster Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2026-07-31Latest test date2+ years COA history 20% underdosed8% low purity 61 28
Lab evidence
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55 Peptide Supply Co Explore test results U.S. reseller No buyer reviews indexed 89Unique reports 2026-04-23Latest test date< 1 year COA history 5% underdosed0% low purity 80 9
Lab evidence
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124 MuscleCandy Explore test results Seller type not reviewed No buyer reviews indexed 89Unique reports 2025-11-18Latest test date3+ years COA history 27% underdosed50% low purity 84 5
Lab evidence
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56 Nova Life Peptides Explore test results U.S. reseller No buyer reviews indexed 88Unique reports 2026-09-19Latest test date< 1 year COA history 3% underdosed0% low purity 68 20
Lab evidence
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132 Renovita Research LLC Explore test results Seller type not reviewed No buyer reviews indexed 88Unique reports 2026-08-08Latest test date1+ year COA history 2% underdosed0% low purity 66 22
Lab evidence
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131 Biocore Peptides Explore test results Seller type not reviewed No buyer reviews indexed 88Unique reports 2026-05-05Latest test date1+ year COA history 5% underdosed2% low purity 88 0
Lab evidence
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133 Innovative Health Lab Explore test results Seller type not reviewed No buyer reviews indexed 87Unique reports 2026-10-22Latest test date< 1 year COA history 3% underdosed0% low purity 13 74
Lab evidence
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135 Hkroids Explore test results Seller type not reviewed No buyer reviews indexed 86Unique reports 2026-10-14Latest test date1+ year COA history 5% low purity 57 29
Lab evidence
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57 TOP — Top Peptide Explore test results U.S. reseller No buyer reviews indexed 86Unique reports 2026-08-13Latest test date2+ years COA history 13% underdosed5% low purity 76 10
Lab evidence
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134 InnerGlow Peptides Explore test results Seller type not reviewed No buyer reviews indexed 86Unique reports 2026-07-15Latest test date1+ year COA history 7% underdosed1% low purity 81 5
Lab evidence
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136 Edge Peptides Explore test results Seller type not reviewed No buyer reviews indexed 86Unique reports 2026-01-28Latest test date1+ year COA history 2% underdosed3% low purity 21 65
Lab evidence
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137 Heritage Labs Explore test results Seller type not reviewed No buyer reviews indexed 85Unique reports 2026-09-13Latest test date1+ year COA history 2% underdosed2% low purity 81 4
Lab evidence
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140 Lipeptides Explore test results Seller type not reviewed No buyer reviews indexed 84Unique reports 2026-10-12Latest test date1+ year COA history 5% low purity 37 47
Lab evidence
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138 Iron Peptides Explore test results Seller type not reviewed No buyer reviews indexed 84Unique reports 2026-09-09Latest test date1+ year COA history 7% underdosed5% low purity 61 23
Lab evidence
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139 Pink Pony Peptides Explore test results Seller type not reviewed No buyer reviews indexed 84Unique reports 2026-08-24Latest test date1+ year COA history 0% underdosed0% low purity 57 27
Lab evidence
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141 PHARMACOM LABS Explore test results Seller type not reviewed No buyer reviews indexed 84Unique reports 2026-03-18Latest test date3+ years COA history 17% underdosed33% low purity 25 59
Lab evidence
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142 Honest Peptide Explore test results Seller type not reviewed No buyer reviews indexed 83Unique reports 2026-10-10Latest test date1+ year COA history 4% underdosed0% low purity 37 46
Lab evidence
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59 Profound Aminos Explore test results U.S. reseller No buyer reviews indexed 82Unique reports 2026-10-16Latest test date< 1 year COA history 2% underdosed0% low purity 57 25
Lab evidence
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144 Sunrise Bioresearch Explore test results Seller type not reviewed No buyer reviews indexed 82Unique reports 2026-10-16Latest test date1+ year COA history 2% underdosed0% low purity 62 20
Lab evidence
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143 MPS Explore test results Seller type not reviewed 3 buyer reviews 82Unique reports 2026-08-11Latest test date1+ year COA history 0% underdosed0% low purity 78 4
Lab evidence
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58 Penguin Peptides Explore test results U.S. reseller No buyer reviews indexed 82Unique reports 2026-08-06Latest test date1+ year COA history 3% underdosed11% low purity 63 19
Lab evidence
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146 QST — Qingdao Saber Technology Pharma Qst Explore test results Seller type not reviewed 1 buyer review 81Unique reports 2026-10-16Latest test date2+ years COA history 0% underdosed0% low purity2 endotoxin failures 62 19
Lab evidence
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145 Xian Yihang Technology Explore test results Seller type not reviewed No buyer reviews indexed 81Unique reports 2026-10-06Latest test date1+ year COA history 2% low purity 71 10
Lab evidence
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147 Legacy Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 81Unique reports 2026-09-22Latest test date< 1 year COA history 5% underdosed0% low purity 45 36
Lab evidence
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60 Blue Ridge Peptides Explore test results U.S. reseller No buyer reviews indexed 81Unique reports 2026-07-27Latest test date< 1 year COA history 0% underdosed0% low purity 68 13
Lab evidence
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149 BARN Explore test results Seller type not reviewed 429 buyer reviews 80Unique reports 2026-10-06Latest test date< 1 year COA history 0% underdosed0% low purity1 endotoxin failure 75 5
Lab evidence
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148 Lumi Peptides Explore test results Seller type not reviewed No buyer reviews indexed 80Unique reports 2026-08-27Latest test date1+ year COA history 9% underdosed3% low purity 79 1
Lab evidence
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150 HEMI PHARMA Explore test results Seller type not reviewed No buyer reviews indexed 80Unique reports 2025-09-01Latest test date5+ years COA history 10% underdosed23% low purity 0 80
Lab evidence
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151 Saiyan Med Explore test results Seller type not reviewed No buyer reviews indexed 79Unique reports 2026-10-05Latest test date< 1 year COA history 0% underdosed1% low purity1 endotoxin failure 6 73
Lab evidence
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152 GENLABS Explore test results Seller type not reviewed No buyer reviews indexed 79Unique reports 2025-12-31Latest test date3+ years COA history 15% underdosed7% low purity 0 79
Lab evidence
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153 Peak Force Labs Explore test results Seller type not reviewed No buyer reviews indexed 78Unique reports 2026-10-14Latest test date< 1 year COA history 6% underdosed0% low purity 68 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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154 Chilton Labs Explore test results Seller type not reviewed No buyer reviews indexed 78Unique reports 2025-11-11Latest test date4+ years COA history 15% low purity 57 21
Lab evidence
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157 Inno Peptides Explore test results Seller type not reviewed No buyer reviews indexed 77Unique reports 2026-10-21Latest test date1+ year COA history 31% underdosed9% low purity 21 56
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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156 Vital Vibe Explore test results Seller type not reviewed No buyer reviews indexed 77Unique reports 2026-09-24Latest test date1+ year COA history 3% underdosed0% low purity 48 29
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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155 Olympex Solutions Explore test results Seller type not reviewed No buyer reviews indexed 77Unique reports 2026-08-30Latest test date1+ year COA history 4% underdosed2% low purity 62 15
Lab evidence
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160 Huaian Hanyou Peptide Explore test results Seller type not reviewed No buyer reviews indexed 76Unique reports 2026-10-09Latest test date1+ year COA history 4% low purity 34 42
Lab evidence
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61 Bulk Peptide Supply Explore test results U.S. reseller No buyer reviews indexed 76Unique reports 2026-10-08Latest test date1+ year COA history 0% underdosed3% low purity 62 14
Lab evidence
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162 NovaLabs Explore test results Seller type not reviewed 1 buyer review 76Unique reports 2026-10-07Latest test date< 1 year COA history 4% underdosed0% low purity 12 64
Lab evidence
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159 Lisa Biopeptide Explore test results Seller type not reviewed No buyer reviews indexed 76Unique reports 2026-09-24Latest test date< 1 year COA history 4% low purity 54 22
Lab evidence
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158 Taurus Peptides,LLC Explore test results Seller type not reviewed No buyer reviews indexed 76Unique reports 2026-08-30Latest test date< 1 year COA history 0% underdosed0% low purity 68 8
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.