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.
Data refreshed Report dates are shown with each test.
U.S.-based domestic resellers
Compound not found
Counts exact-zero identity results in the current comparison. It does not establish that a vial was empty, and it is not an ordinary 0% purity measurement.
Across domestic resellers in this comparison
44 recorded failures across 14,043 applicable results from 101 vendors.
3,047 other eligible records have no included result for this check. Missing and excluded measurements never count as passes.
Latest eligible report: 2026-10-18. 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 name available with ProExplore test results 18failures / 307 tests 5.9%share of tests · 3 sources 2026-10-08latest lab result
Lab evidence
Free preview18 failures in 307 applicable results from this vendor
RetatrutideExplore failed COAs12 / 85 failures / results
- Compound not found 12
CJC-1295Explore failed COAs3 / 9 failures / results
- Compound not found 3
TesamorelinExplore failed COAs2 / 15 failures / results
- Compound not found 2
BPC-157Explore failed COAs1 / 23 failures / results
- Compound not found 1
7 other eligible records have no applicable result for this comparison. 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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Vendor behind these reportsVendor name available with ProSign up to see names Already have an account? Sign in02 Vendor name available with ProExplore test results 7failures / 600 tests 1.2%share of tests · 4 sources 2026-10-09latest lab result
Lab evidence
Free preview7 failures in 600 applicable results from this vendor
IpamorelinExplore failed COAs2 / 21 failures / results
- Compound not found 2
RetatrutideExplore failed COAs1 / 158 failures / results
- Compound not found 1
TirzepatideExplore failed COAs1 / 128 failures / results
- Compound not found 1
TesamorelinExplore failed COAs1 / 42 failures / results
- Compound not found 1
BPC-157Explore failed COAs1 / 31 failures / results
- Compound not found 1
Explore all 6 compounds with failures
Showing 5 of 6 compound groups with failures. 135 other eligible records have no applicable result for this comparison. 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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Vendor behind these reportsVendor name available with ProSign up to see names Already have an account? Sign in03 Peptide GurusExplore test results 2failures / 151 tests 1.3%share of tests · 2 sources 2026-09-01latest lab result
Lab evidence
Free preview2 failures in 151 applicable results from this vendor
RetatrutideExplore failed COAs2 / 12 failures / results
- Compound not found 2
34 other eligible records have no applicable result for this comparison. 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.
04 TOP — Top PeptideExplore test results 2failures / 73 tests 2.7%share of tests · 4 sources 2026-08-13latest lab result
Lab evidence
Free preview2 failures in 73 applicable results from this vendor
SemaglutideExplore failed COAs1 / 4 failures / results
- Compound not found 1
TesamorelinExplore failed COAs1 / 4 failures / results
- Compound not found 1
7 other eligible records have no applicable result for this comparison. 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.
05 Penguin PeptidesExplore test results 2failures / 63 tests 3.2%share of tests · 4 sources 2026-08-06latest lab result
Lab evidence
Free preview2 failures in 63 applicable results from this vendor
RetatrutideExplore failed COAs2 / 11 failures / results
- Compound not found 2
19 other eligible records have no applicable result for this comparison. 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.
06 CorePeptidesExplore test results 2failures / 34 tests 5.9%share of tests · 3 sources 2026-10-01latest lab result
Lab evidence
Free preview2 failures in 34 applicable results from this vendor
RetatrutideExplore failed COAs1 / 5 failures / results
- Compound not found 1
TirzepatideExplore failed COAs1 / 3 failures / results
- Compound not found 1
13 other eligible records have no applicable result for this comparison. 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 Peptilab ResearchExplore test results 2failures / 14 tests 14.3%share of tests · 1 source 2025-05-20latest lab result
Lab evidence
Free preview2 failures in 14 applicable results from this vendor
CJC-1295Explore failed COAs2 / 2 failures / results
- Compound not found 2
0 other eligible records have no applicable result for this comparison. 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.
08 Vendor name available with ProExplore test results 1failures / 660 tests 0.2%share of tests · 3 sources 2026-10-18latest lab result
Lab evidence
Free preview1 failure in 660 applicable results from this vendor
RetatrutideExplore failed COAs1 / 73 failures / results
- Compound not found 1
54 other eligible records have no applicable result for this comparison. 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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Vendor behind these reportsVendor name available with ProSign up to see names Already have an account? Sign in09 Vendor name available with ProExplore test results 1failures / 530 tests 0.2%share of tests · 4 sources 2026-10-16latest lab result
Lab evidence
Free preview1 failure in 530 applicable results from this vendor
RetatrutideExplore failed COAs1 / 107 failures / results
- Compound not found 1
174 other eligible records have no applicable result for this comparison. 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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Vendor behind these reportsVendor name available with ProSign up to see names Already have an account? Sign in10 Vendor name available with ProExplore test results 1failures / 220 tests 0.5%share of tests · 3 sources 2026-10-13latest lab result
Lab evidence
Free preview1 failure in 220 applicable results from this vendor
RetatrutideExplore failed COAs1 / 24 failures / results
- Compound not found 1
68 other eligible records have no applicable result for this comparison. 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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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: 2026-10-18. Method and limitations →