International peptide vendors
The most-reviewed
international peptide vendors.
Compare international vendors by their unique independent lab reports. This group includes reviewed manufacturers, exporters and other international sellers. Being listed here does not prove factory ownership.
International peptide vendor rankings
Most-reviewed international peptide vendors
Showing ranks 1–30 of 30. The order is based on unique independent lab reports, not a quality score. Lab-test percentages require at least five applicable dose or purity results; explicit endotoxin failures are always shown.
01 Vendor identity hiddenExplore test results 389 buyer reports 1,435Unique reports 2026-08-31Last observed 1% short-dosed1% low purity4 endotoxin fails 1,165 270
Inside the lab evidence
Public preview50 failures in 1,101 applicable results from this vendor
- Endotoxin failure 10
- Purity below 97% 6
- At least 10% short 4
Lowest measured purity 29.46%Largest measured shortfall 15.4%
- At least 10% short 5
- Endotoxin failure 1
Lowest measured purity 98.91%Largest measured shortfall 71.08%
- At least 10% short 4
- Compound not found 1
Lowest measured purity 99.12%Largest measured shortfall 28.7%
- At least 10% short 4
- Endotoxin failure 1
Lowest measured purity 98.69%Largest measured shortfall 15.6%
Showing 5 of 15 compound groups with failures. 203 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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02 Vendor identity hiddenExplore test results 82 buyer reports 606Unique reports 2026-08-13Last observed 5% short-dosed17% low purity 509 97
Inside the lab evidence
Public preview75 failures in 416 applicable results from this vendor
- Purity below 97% 34
- At least 10% short 1
Lowest measured purity 74.66%Largest measured shortfall 12.12%
- Purity below 97% 13
Lowest measured purity 95.79%
- Purity below 97% 3
- At least 10% short 10
Lowest measured purity 89.04%Largest measured shortfall 61.2%
- Purity below 97% 3
Lowest measured purity 91.09%
- At least 10% short 2
Lowest measured purity 98.19%Largest measured shortfall 14.1%
Showing 5 of 12 compound groups with failures. 104 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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03 Vendor identity hiddenExplore test results No buyer reports yet 513Unique reports 2026-08-13Last observed 0% short-dosed1% low purity 479 34
Inside the lab evidence
Public preview43 failures in 499 applicable results from this vendor
- At least 10% short 6
- Compound not found 3
Lowest measured purity 98.34%Largest measured shortfall 44%
- At least 10% short 7
- Compound not found 1
Lowest measured purity 98.76%Largest measured shortfall 56.6%
- At least 10% short 5
- Compound not found 3
Lowest measured purity 97.68%Largest measured shortfall 45.4%
- At least 10% short 3
- Compound not found 1
Lowest measured purity 99.39%Largest measured shortfall 16.2%
- Purity below 97% 1
- At least 10% short 3
Lowest measured purity 96.3%Largest measured shortfall 49.7%
Showing 5 of 14 compound groups with failures. 10 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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04 Vendor identity hiddenExplore test results 3 buyer reports 362Unique reports 2026-08-13Last observed 23% short-dosed6% low purity1 endotoxin fail 324 38
Inside the lab evidence
Public preview67 failures in 362 applicable results from this vendor
- Purity below 97% 7
- At least 10% short 2
- Compound not found 4
Lowest measured purity 80.79%Largest measured shortfall 27.2%
- Purity below 97% 1
- At least 10% short 10
- Endotoxin failure 1
Lowest measured purity 95.63%Largest measured shortfall 55%
- At least 10% short 10
Lowest measured purity 99.39%Largest measured shortfall 40.4%
- Purity below 97% 4
- At least 10% short 5
- Compound not found 1
Lowest measured purity 72.47%Largest measured shortfall 53%
- Purity below 97% 6
- At least 10% short 2
- Compound not found 1
Lowest measured purity 63.02%Largest measured shortfall 20.9%
Showing 5 of 14 compound groups with failures. 0 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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05 Vendor identity hiddenExplore test results No buyer reports yet 350Unique reports 2026-05-06Last observed 3% short-dosed8% low purity 280 70
Inside the lab evidence
Public preview68 failures in 341 applicable results from this vendor
- Purity below 97% 2
- At least 10% short 11
- Compound not found 1
Lowest measured purity 95.58%Largest measured shortfall 88.8%
- Purity below 97% 6
- At least 10% short 6
Lowest measured purity 72.05%Largest measured shortfall 49.5%
- Purity below 97% 5
- At least 10% short 7
Lowest measured purity 81.61%Largest measured shortfall 26.9%
- Purity below 97% 6
- At least 10% short 1
- Compound not found 1
Lowest measured purity 94%Largest measured shortfall 17.8%
- At least 10% short 6
Lowest measured purity 99.67%Largest measured shortfall 23%
Showing 5 of 16 compound groups with failures. 10 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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06 Vendor identity hiddenExplore test results No buyer reports yet 319Unique reports 2026-08-21Last observed 0% short-dosed1% low purity 288 31
Inside the lab evidence
Public preview37 failures in 316 applicable results from this vendor
- At least 10% short 8
- Compound not found 1
Lowest measured purity 98.01%Largest measured shortfall 65.7%
- At least 10% short 6
- Compound not found 1
Lowest measured purity 98.1%Largest measured shortfall 31.3%
- At least 10% short 5
Lowest measured purity 98.61%Largest measured shortfall 41.9%
- At least 10% short 4
Lowest measured purity 99%Largest measured shortfall 27.5%
- At least 10% short 3
Lowest measured purity 98.79%Largest measured shortfall 49.1%
Showing 5 of 10 compound groups with failures. 2 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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07 Vendor identity hiddenExplore test results No buyer reports yet 312Unique reports 2026-08-21Last observed 5% low purity 282 30
Inside the lab evidence
Public preview62 failures in 311 applicable results from this vendor
- At least 10% short 17
Lowest measured purity 99.2%Largest measured shortfall 30.6%
- Purity below 97% 3
- At least 10% short 7
- Compound not found 6
Lowest measured purity 89.26%Largest measured shortfall 38.4%
- Purity below 97% 6
- At least 10% short 1
Lowest measured purity 89.7%Largest measured shortfall 50.3%
- Purity below 97% 1
- At least 10% short 4
- Compound not found 1
Lowest measured purity 96.23%Largest measured shortfall 10.9%
- Purity below 97% 2
- At least 10% short 2
- Compound not found 1
Lowest measured purity 51.3%Largest measured shortfall 23.33%
Showing 5 of 12 compound groups with failures. 0 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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08 Vendor identity hiddenExplore test results 2 buyer reports 291Unique reports 2026-08-13Last observed 0% short-dosed8% low purity 278 13
Inside the lab evidence
Public preview63 failures in 279 applicable results from this vendor
- Purity below 97% 2
- At least 10% short 12
Lowest measured purity 90.02%Largest measured shortfall 45.5%
- Purity below 97% 1
- At least 10% short 8
Lowest measured purity 95.9%Largest measured shortfall 67.9%
- Purity below 97% 6
- At least 10% short 5
- Compound not found 1
Lowest measured purity 47.46%Largest measured shortfall 49.3%
- Purity below 97% 3
- At least 10% short 4
Lowest measured purity 93.36%Largest measured shortfall 14%
- At least 10% short 6
Lowest measured purity 99.7%Largest measured shortfall 43.3%
Showing 5 of 14 compound groups with failures. 12 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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09 Vendor identity hiddenExplore test results 34 buyer reports 255Unique reports 2026-08-09Last observed 1% short-dosed0% low purity6 endotoxin fails 214 41
Inside the lab evidence
Public preview18 failures in 223 applicable results from this vendor
- At least 10% short 6
Lowest measured purity 99.07%Largest measured shortfall 42.8%
- At least 10% short 4
- Endotoxin failure 1
Lowest measured purity 98.78%Largest measured shortfall 27.6%
- Endotoxin failure 2
Lowest measured purity 99.45%
- At least 10% short 1
- Compound not found 1
Lowest measured purity 99.59%Largest measured shortfall 14.02%
- At least 10% short 1
Lowest measured purity 99.33%Largest measured shortfall 21.18%
Showing 5 of 7 compound groups with failures. 31 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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10 Vendor identity hiddenExplore test results No buyer reports yet 228Unique reports 2026-05-13Last observed 0% short-dosed1% low purity 177 51
Inside the lab evidence
Public preview21 failures in 218 applicable results from this vendor
- At least 10% short 4
Lowest measured purity 98.91%Largest measured shortfall 32.4%
- Purity below 97% 1
- At least 10% short 3
Lowest measured purity 96.69%Largest measured shortfall 20.3%
- Purity below 97% 1
- At least 10% short 3
Lowest measured purity 96.45%Largest measured shortfall 25.65%
- At least 10% short 2
Lowest measured purity 99.28%Largest measured shortfall 14%
- At least 10% short 2
Lowest measured purity 99.06%Largest measured shortfall 26.96%
Showing 5 of 11 compound groups with failures. 10 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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11 Vendor identity hiddenExplore test results 77 buyer reports 200Unique reports 2026-08-05Last observed 2% short-dosed6% low purity 172 28
Inside the lab evidence
Public preview24 failures in 187 applicable results from this vendor
- Purity below 97% 3
- At least 10% short 2
- Compound not found 2
Lowest measured purity 69.6%Largest measured shortfall 50%
- At least 10% short 4
Lowest measured purity 97.39%Largest measured shortfall 46%
- Purity below 97% 1
- At least 10% short 3
- Compound not found 1
Lowest measured purity 95.81%Largest measured shortfall 52.1%
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 93.92%Largest measured shortfall 28.9%
- Purity below 97% 1
Lowest measured purity 91.46%
Showing 5 of 10 compound groups with failures. 12 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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12 Vendor identity hiddenExplore test results 331 buyer reports 192Unique reports 2026-08-03Last observed 0% short-dosed2% low purity 169 23
Inside the lab evidence
Public preview13 failures in 143 applicable results from this vendor
- At least 10% short 3
- Compound not found 1
Lowest measured purity 98.5%Largest measured shortfall 40.7%
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 64.59%Largest measured shortfall 13.5%
- Purity below 97% 1
- Compound not found 1
Lowest measured purity 91.13%
- Purity below 97% 1
- At least 10% short 1
Lowest measured purity 96.48%Largest measured shortfall 29%
- Purity below 97% 1
Lowest measured purity 95%
Showing 5 of 6 compound groups with failures. 49 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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13 Vendor identity hiddenExplore test results 557 buyer reports 186Unique reports 2026-08-23Last observed 0% short-dosed3% low purity7 endotoxin fails 159 27
Inside the lab evidence
Public preview26 failures in 160 applicable results from this vendor
- Endotoxin failure 9
Lowest measured purity 99.47%
- Purity below 97% 1
- At least 10% short 4
Lowest measured purity 93.8%Largest measured shortfall 30.33%
- At least 10% short 2
- Endotoxin failure 1
Lowest measured purity 99.6%Largest measured shortfall 25.6%
- Purity below 97% 2
- At least 10% short 1
- Endotoxin failure 1
Lowest measured purity 81.92%Largest measured shortfall 42.5%
- Endotoxin failure 2
Lowest measured purity 98.84%
Showing 5 of 9 compound groups with failures. 20 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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14 Vendor identity hiddenExplore test results No buyer reports yet 164Unique reports 2026-08-13Last observed 3% low purity 154 10
Inside the lab evidence
Public preview38 failures in 164 applicable results from this vendor
- At least 10% short 10
- Compound not found 2
Lowest measured purity 98.3%Largest measured shortfall 65.2%
- Purity below 97% 3
- At least 10% short 4
- Compound not found 2
Lowest measured purity 85.61%Largest measured shortfall 46%
- At least 10% short 7
Lowest measured purity 99.77%Largest measured shortfall 56.3%
- At least 10% short 4
- Compound not found 1
Lowest measured purity 98.2%Largest measured shortfall 60.2%
- At least 10% short 2
- Compound not found 1
Lowest measured purity 98.49%Largest measured shortfall 17.3%
Showing 5 of 6 compound groups with failures. 0 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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15 Vendor identity hiddenExplore test results 627 buyer reports 164Unique reports 2026-08-21Last observed 4% short-dosed3% low purity1 endotoxin fail 151 13
Inside the lab evidence
Public preview23 failures in 143 applicable results from this vendor
- Purity below 97% 1
- At least 10% short 10
Lowest measured purity 95.59%Largest measured shortfall 91.3%
- Purity below 97% 1
- At least 10% short 1
- Compound not found 1
- Endotoxin failure 1
Lowest measured purity 90.6%Largest measured shortfall 23.9%
- At least 10% short 2
- Compound not found 1
Lowest measured purity 98.6%Largest measured shortfall 24.2%
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 96.69%Largest measured shortfall 39.1%
- At least 10% short 1
Lowest measured purity 99.66%Largest measured shortfall 12%
Showing 5 of 7 compound groups with failures. 7 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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16 Vendor identity hiddenExplore test results No buyer reports yet 156Unique reports 2026-08-18Last observed 0% short-dosed5% low purity 112 44
Inside the lab evidence
Public preview24 failures in 148 applicable results from this vendor
- At least 10% short 7
- Compound not found 1
Lowest measured purity 98.94%Largest measured shortfall 36%
- Purity below 97% 1
- At least 10% short 6
Lowest measured purity 94.4%Largest measured shortfall 34.8%
- Purity below 97% 5
Lowest measured purity 95.56%
- Purity below 97% 1
- At least 10% short 3
Lowest measured purity 85.9%Largest measured shortfall 51.7%
- At least 10% short 1
- Compound not found 1
Lowest measured purity 99.2%Largest measured shortfall 12.2%
5 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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17 Vendor identity hiddenExplore test results No buyer reports yet 140Unique reports 2026-07-20Last observed 3% low purity1 endotoxin fail 139 1
Inside the lab evidence
Public preview26 failures in 140 applicable results from this vendor
- At least 10% short 6
- Endotoxin failure 1
Lowest measured purity 98.87%Largest measured shortfall 48.2%
- Purity below 97% 2
- At least 10% short 5
- Compound not found 1
Lowest measured purity 88.09%Largest measured shortfall 47.6%
- At least 10% short 3
- Compound not found 1
Lowest measured purity 98.2%Largest measured shortfall 24.4%
- Purity below 97% 1
- At least 10% short 2
- Compound not found 1
Lowest measured purity 12.7%Largest measured shortfall 82.4%
- At least 10% short 2
Lowest measured purity 98.46%Largest measured shortfall 38%
Showing 5 of 8 compound groups with failures. 0 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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18 Vendor identity hiddenExplore test results 742 buyer reports 137Unique reports 2026-08-17Last observed 3% short-dosed3% low purity 123 14
Inside the lab evidence
Public preview14 failures in 101 applicable results from this vendor
- At least 10% short 3
- Compound not found 1
Lowest measured purity 99.24%Largest measured shortfall 14%
- At least 10% short 1
- Compound not found 2
Lowest measured purity 99.15%Largest measured shortfall 13%
- Purity below 97% 2
Lowest measured purity 93.61%
- At least 10% short 1
Lowest measured purity 99.21%Largest measured shortfall 15.6%
- Purity below 97% 1
Lowest measured purity 95.35%
Showing 5 of 8 compound groups with failures. 8 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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19 Vendor identity hiddenExplore test results 429 buyer reports 135Unique reports 2026-08-13Last observed 0% short-dosed2% low purity 114 21
Inside the lab evidence
Public preview26 failures in 130 applicable results from this vendor
- At least 10% short 9
- Compound not found 1
Lowest measured purity 98.22%Largest measured shortfall 49.5%
- At least 10% short 4
Lowest measured purity 99.5%Largest measured shortfall 64%
- Purity below 97% 1
- At least 10% short 3
Lowest measured purity 81.9%Largest measured shortfall 26.4%
- Purity below 97% 2
- Compound not found 1
Lowest measured purity 78.24%
- At least 10% short 2
Lowest measured purity 98.9%Largest measured shortfall 67.6%
Showing 5 of 8 compound groups with failures. 4 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
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20 Vendor identity hiddenExplore test results 126 buyer reports 128Unique reports 2026-06-22Last observed 0% short-dosed0% low purity 79 49
Inside the lab evidence
Public preview2 failures in 107 applicable results from this vendor
- Compound not found 1
Lowest measured purity 99.29%
- At least 10% short 1
Lowest measured purity 99.28%Largest measured shortfall 17.1%
21 other eligible records have no applicable result for this comparison. A sample can fail several checks; it counts once in the overall total. Includes reports with a checkable source and a usable result for this comparison. Results describe the submitted samples. Missing results never count as passes.
Pro reveals the name and gives you access to the lab-report archive.
Each report counts once, even when it tests several compounds or appears in multiple archives. Open a vendor profile for its batch reports. See the methodology and known limitations.
Explore low purity, underfilled samples and other lab findings for this seller group →