Peptide vendor lab results
Where lab tests
found problems.
Compare recorded test failures within each seller group. Counts show what was found in tested samples, not everything a vendor sells.
U.S.-based domestic resellers
Most lab-test failures
A tested sample counts once if it has low purity, a short fill, an identity failure or a failed endotoxin test. Different samples have different tests; this is a count of recorded problems, not an overall quality grade.
Across domestic resellers in this comparison
920 recorded failures across 14,382 applicable results from 100 vendors.
1,223 other eligible records have no included result for this check. Missing and excluded measurements never count as passes.
1 failures belong to vendors with fewer than 10 applicable results, so those vendors are not ranked below.
Latest eligible report: 2026-09-01. Each row below shows one vendor’s own test history.
Open a vendor row to explore compounds and test failures. Reveal protected names with Pro.
01 Vendor identity hiddenExplore test results 95failures / 272 tests 34.9%share of tests · 3 sources 2026-08-03latest lab result
Inside the lab evidence
Public preview95 failures in 272 applicable results from this vendor
RetatrutideExplore failed COAs29 / 81 failures / results
- At least 10% short 18
- Compound not found 11
Lowest measured purity 98.83%Largest measured shortfall 46%
TirzepatideExplore failed COAs11 / 58 failures / results
- At least 10% short 11
Lowest measured purity 98.4%Largest measured shortfall 22.2%
SemaglutideExplore failed COAs11 / 21 failures / results
- At least 10% short 11
Lowest measured purity 98.8%Largest measured shortfall 28%
CJC-1295Explore failed COAs9 / 9 failures / results
- At least 10% short 6
- Compound not found 3
Lowest measured purity 98.69%Largest measured shortfall 53%
BPC-157Explore failed COAs7 / 22 failures / results
- At least 10% short 6
- Compound not found 1
Lowest measured purity 98.24%Largest measured shortfall 17.6%
Explore all 11 compounds with failures
Showing 5 of 11 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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02 Vendor identity hiddenExplore test results 84failures / 586 tests 14.3%share of tests · 4 sources 2026-08-13latest lab result
Inside the lab evidence
Public preview84 failures in 586 applicable results from this vendor
RetatrutideExplore failed COAs34 / 159 failures / results
- Purity below 97% 5
- At least 10% short 29
- Compound not found 1
Lowest measured purity 93.97%Largest measured shortfall 26.2%
TirzepatideExplore failed COAs17 / 123 failures / results
- At least 10% short 16
- Compound not found 1
Lowest measured purity 97.27%Largest measured shortfall 29.7%
TesamorelinExplore failed COAs7 / 40 failures / results
- Purity below 97% 3
- At least 10% short 4
- Compound not found 1
Lowest measured purity 63.84%Largest measured shortfall 31%
BPC-157Explore failed COAs6 / 28 failures / results
- At least 10% short 5
- Compound not found 1
Lowest measured purity 97.19%Largest measured shortfall 25.7%
CJC-1295Explore failed COAs6 / 12 failures / results
- Purity below 97% 5
- At least 10% short 1
Lowest measured purity 91.99%Largest measured shortfall 13.2%
Explore all 12 compounds with failures
Showing 5 of 12 compound groups with failures. 116 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 42failures / 612 tests 6.9%share of tests · 4 sources 2026-08-23latest lab result
Inside the lab evidence
Public preview42 failures in 612 applicable results from this vendor
Other compoundsExplore failed COAs13 / 182 failures / results
- Purity below 97% 4
- At least 10% short 10
Lowest measured purity 9.64%Largest measured shortfall 32.87%
RetatrutideExplore failed COAs6 / 80 failures / results
- Purity below 97% 1
- At least 10% short 4
- Compound not found 1
Lowest measured purity 92.48%Largest measured shortfall 49.19%
AOD-9604Explore failed COAs4 / 10 failures / results
- Purity below 97% 1
- At least 10% short 4
Lowest measured purity 94.61%Largest measured shortfall 89.12%
CJC-1295 w/ DACExplore failed COAs4 / 7 failures / results
- Purity below 97% 4
- At least 10% short 2
Lowest measured purity 31.94%Largest measured shortfall 97.14%
KPVExplore failed COAs3 / 16 failures / results
- At least 10% short 3
Lowest measured purity 98.02%Largest measured shortfall 81.36%
Explore all 14 compounds with failures
Showing 5 of 14 compound groups with failures. 48 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 40failures / 607 tests 6.6%share of tests · 2 sources 2026-08-30latest lab result
Inside the lab evidence
Public preview40 failures in 607 applicable results from this vendor
Other compoundsExplore failed COAs12 / 112 failures / results
- Purity below 97% 9
- At least 10% short 3
Lowest measured purity 58.8%Largest measured shortfall 19%
RetatrutideExplore failed COAs5 / 62 failures / results
- At least 10% short 4
- Compound not found 1
Lowest measured purity 98.74%Largest measured shortfall 28.3%
SemaglutideExplore failed COAs3 / 18 failures / results
- At least 10% short 3
Lowest measured purity 99.69%Largest measured shortfall 60.5%
AOD-9604Explore failed COAs3 / 13 failures / results
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 87.76%Largest measured shortfall 38%
Melanotan IIExplore failed COAs3 / 7 failures / results
- At least 10% short 3
Lowest measured purity 98.08%Largest measured shortfall 27%
Explore all 14 compounds with failures
Showing 5 of 14 compound groups with failures. 37 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 35failures / 1,446 tests 2.4%share of tests · 1 source 2026-08-29latest lab result
Inside the lab evidence
Public preview35 failures in 1,446 applicable results from this vendor
Other compoundsExplore failed COAs9 / 441 failures / results
- Purity below 97% 5
- At least 10% short 4
Lowest measured purity 95.32%Largest measured shortfall 43.5%
KPVExplore failed COAs5 / 23 failures / results
- At least 10% short 5
Lowest measured purity 99.18%Largest measured shortfall 15.7%
GHRP-6Explore failed COAs3 / 6 failures / results
- At least 10% short 3
Lowest measured purity 99.49%Largest measured shortfall 22.2%
RetatrutideExplore failed COAs2 / 129 failures / results
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 49.94%Largest measured shortfall 48.4%
MOTS-CExplore failed COAs2 / 49 failures / results
- At least 10% short 2
Lowest measured purity 98.74%Largest measured shortfall 12.5%
Explore all 16 compounds with failures
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 Peptide GurusExplore test results 31failures / 167 tests 18.6%share of tests · 2 sources 2026-09-01latest lab result
Inside the lab evidence
Public preview31 failures in 167 applicable results from this vendor
IpamorelinExplore failed COAs7 / 11 failures / results
- At least 10% short 7
Lowest measured purity 98.16%Largest measured shortfall 34.6%
TirzepatideExplore failed COAs6 / 21 failures / results
- Purity below 97% 3
- At least 10% short 6
Lowest measured purity 96.46%Largest measured shortfall 18.6%
BPC-157Explore failed COAs4 / 16 failures / results
- Purity below 97% 4
Lowest measured purity 96.21%
Melanotan IIExplore failed COAs4 / 6 failures / results
- At least 10% short 4
Lowest measured purity 98.01%Largest measured shortfall 21.7%
RetatrutideExplore failed COAs3 / 12 failures / results
- At least 10% short 1
- Compound not found 2
Lowest measured purity 98.39%Largest measured shortfall 13.7%
Explore all 10 compounds with failures
Showing 5 of 10 compound groups with failures. 17 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.
Read the evidence behind the summary.View vendorCheck the original reports, dates and tested batches.
07 Vendor identity hiddenExplore test results 25failures / 267 tests 9.4%share of tests · 3 sources 2026-08-27latest lab result
Inside the lab evidence
Public preview25 failures in 267 applicable results from this vendor
Other compoundsExplore failed COAs6 / 87 failures / results
- At least 10% short 6
Lowest measured purity 97.22%Largest measured shortfall 43.05%
CJC-1295Explore failed COAs6 / 11 failures / results
- Purity below 97% 6
- At least 10% short 2
Lowest measured purity 68.75%Largest measured shortfall 42.6%
RetatrutideExplore failed COAs3 / 22 failures / results
- At least 10% short 2
- Compound not found 1
Lowest measured purity 97.8%Largest measured shortfall 22%
BPC-157Explore failed COAs3 / 18 failures / results
- Purity below 97% 3
Lowest measured purity 95.29%
TirzepatideExplore failed COAs2 / 10 failures / results
- At least 10% short 2
Lowest measured purity 99.18%Largest measured shortfall 17.4%
Explore all 8 compounds with failures
Showing 5 of 8 compound groups with failures. 16 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 Nuscience PeptidesExplore test results 24failures / 136 tests 17.6%share of tests · 2 sources 2026-07-23latest lab result
Inside the lab evidence
Public preview24 failures in 136 applicable results from this vendor
RetatrutideExplore failed COAs4 / 18 failures / results
- Purity below 97% 3
- At least 10% short 1
Lowest measured purity 93.68%Largest measured shortfall 12.1%
SemaglutideExplore failed COAs4 / 13 failures / results
- Purity below 97% 2
- At least 10% short 2
Lowest measured purity 95.91%Largest measured shortfall 17.3%
CJC-1295Explore failed COAs3 / 5 failures / results
- Purity below 97% 3
- At least 10% short 3
Lowest measured purity 80.79%Largest measured shortfall 25.2%
TirzepatideExplore failed COAs2 / 13 failures / results
- At least 10% short 2
Lowest measured purity 99%Largest measured shortfall 34.7%
BPC-157Explore failed COAs2 / 7 failures / results
- At least 10% short 2
Lowest measured purity 97.47%Largest measured shortfall 18.2%
Explore all 11 compounds with failures
Showing 5 of 11 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.
Read the evidence behind the summary.View vendorCheck the original reports, dates and tested batches.
09 Vendor identity hiddenExplore test results 21failures / 544 tests 3.9%share of tests · 1 source 2026-08-30latest lab result
Inside the lab evidence
Public preview21 failures in 544 applicable results from this vendor
Other compoundsExplore failed COAs10 / 106 failures / results
- Purity below 97% 5
- At least 10% short 5
Lowest measured purity 96.33%Largest measured shortfall 19.9%
AOD-9604Explore failed COAs3 / 13 failures / results
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 88.19%Largest measured shortfall 29%
5-Amino-1MQExplore failed COAs3 / 9 failures / results
- At least 10% short 3
Lowest measured purity 99.41%Largest measured shortfall 19.9%
NAD+Explore failed COAs1 / 21 failures / results
- At least 10% short 1
Lowest measured purity 99.14%Largest measured shortfall 10.79%
GHK-CuExplore failed COAs1 / 16 failures / results
- At least 10% short 1
Lowest measured purity 99.27%Largest measured shortfall 17.11%
Explore all 8 compounds with failures
Showing 5 of 8 compound groups with failures. 34 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 21failures / 467 tests 4.5%share of tests · 3 sources 2026-09-01latest lab result
Inside the lab evidence
Public preview21 failures in 467 applicable results from this vendor
Other compoundsExplore failed COAs8 / 78 failures / results
- Purity below 97% 2
- At least 10% short 6
Lowest measured purity 96.95%Largest measured shortfall 37%
RetatrutideExplore failed COAs2 / 81 failures / results
- Purity below 97% 1
- At least 10% short 1
Lowest measured purity 40.86%Largest measured shortfall 20.58%
GHK-CuExplore failed COAs2 / 24 failures / results
- At least 10% short 2
Lowest measured purity 99.45%Largest measured shortfall 88.61%
DSIPExplore failed COAs2 / 9 failures / results
- Purity below 97% 1
- At least 10% short 2
Lowest measured purity 89.76%Largest measured shortfall 67.75%
NAD+Explore failed COAs1 / 20 failures / results
- At least 10% short 1
Lowest measured purity 99.33%Largest measured shortfall 14.55%
Explore all 11 compounds with failures
Showing 5 of 11 compound groups with failures. 35 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.
Connect these results to a vendor.Reveal vendor with ProPro reveals the name and gives you access to the lab-report archive.
Showing up to 10 vendors with at least 10 applicable results each. Ordered by the number of failed results, so heavily tested vendors may appear higher. Read the count and share together. Duplicate certificates are excluded. Missing tests never count as passes. Latest included report: 2026-09-01. Method and limitations →