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
Underfilled samples
Counts valid quantity results at least 10% below the stated amount. Tests can compare against different claims; inspect the original report before comparing individual products.
Across domestic resellers in this comparison
689 recorded failures across 10,134 applicable results from 99 vendors.
5,471 other eligible records have no included result for this check. Missing and excluded measurements never count as passes.
3 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.
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01 Vendor identity hiddenExplore test results 76failures / 251 tests 30.3%share of tests · 3 sources 2026-08-03latest lab result
Inside the lab evidence
Public preview76 failures in 251 applicable results from this vendor
RetatrutideExplore failed COAs18 / 69 failures / results
- At least 10% short 18
Largest measured shortfall 46%
TirzepatideExplore failed COAs11 / 57 failures / results
- At least 10% short 11
Largest measured shortfall 22.2%
SemaglutideExplore failed COAs11 / 20 failures / results
- At least 10% short 11
Largest measured shortfall 28%
GHK-CuExplore failed COAs7 / 18 failures / results
- At least 10% short 7
Largest measured shortfall 26.7%
BPC-157Explore failed COAs6 / 21 failures / results
- At least 10% short 6
Largest measured shortfall 17.6%
Explore all 11 compounds with failures
Showing 5 of 11 compound groups with failures. 21 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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02 Vendor identity hiddenExplore test results 62failures / 506 tests 12.3%share of tests · 4 sources 2026-08-13latest lab result
Inside the lab evidence
Public preview62 failures in 506 applicable results from this vendor
RetatrutideExplore failed COAs29 / 146 failures / results
- At least 10% short 29
Largest measured shortfall 26.2%
TirzepatideExplore failed COAs16 / 105 failures / results
- At least 10% short 16
Largest measured shortfall 29.7%
BPC-157Explore failed COAs5 / 26 failures / results
- At least 10% short 5
Largest measured shortfall 25.7%
TesamorelinExplore failed COAs4 / 35 failures / results
- At least 10% short 4
Largest measured shortfall 31%
CagrilintideExplore failed COAs3 / 21 failures / results
- At least 10% short 3
Largest measured shortfall 18.4%
Explore all 9 compounds with failures
Showing 5 of 9 compound groups with failures. 196 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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03 Vendor identity hiddenExplore test results 27failures / 579 tests 4.7%share of tests · 1 source 2026-08-29latest lab result
Inside the lab evidence
Public preview27 failures in 579 applicable results from this vendor
KPVExplore failed COAs5 / 9 failures / results
- At least 10% short 5
Largest measured shortfall 15.7%
Other compoundsExplore failed COAs4 / 75 failures / results
- At least 10% short 4
Largest measured shortfall 43.5%
GHRP-6Explore failed COAs3 / 3 failures / results
- At least 10% short 3
Largest measured shortfall 22.2%
RetatrutideExplore failed COAs2 / 104 failures / results
- At least 10% short 2
Largest measured shortfall 48.4%
MOTS-CExplore failed COAs2 / 33 failures / results
- At least 10% short 2
Largest measured shortfall 12.5%
Explore all 13 compounds with failures
Showing 5 of 13 compound groups with failures. 877 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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04 Vendor identity hiddenExplore test results 27failures / 480 tests 5.6%share of tests · 4 sources 2026-08-23latest lab result
Inside the lab evidence
Public preview27 failures in 480 applicable results from this vendor
Other compoundsExplore failed COAs10 / 141 failures / results
- At least 10% short 10
Largest measured shortfall 32.87%
RetatrutideExplore failed COAs4 / 68 failures / results
- At least 10% short 4
Largest measured shortfall 49.19%
AOD-9604Explore failed COAs4 / 8 failures / results
- At least 10% short 4
Largest measured shortfall 89.12%
KPVExplore failed COAs3 / 13 failures / results
- At least 10% short 3
Largest measured shortfall 81.36%
CJC-1295 w/ DACExplore failed COAs2 / 5 failures / results
- At least 10% short 2
Largest measured shortfall 97.14%
Explore all 9 compounds with failures
Showing 5 of 9 compound groups with failures. 180 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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05 Vendor identity hiddenExplore test results 25failures / 462 tests 5.4%share of tests · 2 sources 2026-08-30latest lab result
Inside the lab evidence
Public preview25 failures in 462 applicable results from this vendor
RetatrutideExplore failed COAs4 / 55 failures / results
- At least 10% short 4
Largest measured shortfall 28.3%
Other compoundsExplore failed COAs3 / 80 failures / results
- At least 10% short 3
Largest measured shortfall 19%
SemaglutideExplore failed COAs3 / 12 failures / results
- At least 10% short 3
Largest measured shortfall 60.5%
Melanotan IIExplore failed COAs3 / 7 failures / results
- At least 10% short 3
Largest measured shortfall 27%
GHK-CuExplore failed COAs2 / 17 failures / results
- At least 10% short 2
Largest measured shortfall 23%
Explore all 12 compounds with failures
Showing 5 of 12 compound groups with failures. 182 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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06 Peptide GurusExplore test results 23failures / 160 tests 14.4%share of tests · 2 sources 2026-09-01latest lab result
Inside the lab evidence
Public preview23 failures in 160 applicable results from this vendor
IpamorelinExplore failed COAs7 / 11 failures / results
- At least 10% short 7
Largest measured shortfall 34.6%
TirzepatideExplore failed COAs6 / 20 failures / results
- At least 10% short 6
Largest measured shortfall 18.6%
Melanotan IIExplore failed COAs4 / 6 failures / results
- At least 10% short 4
Largest measured shortfall 21.7%
CJC-1295Explore failed COAs3 / 8 failures / results
- At least 10% short 3
Largest measured shortfall 13.6%
Other compoundsExplore failed COAs1 / 22 failures / results
- At least 10% short 1
Largest measured shortfall 85.23%
Explore all 7 compounds with failures
Showing 5 of 7 compound groups with failures. 24 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.
07 Peptide PartnersExplore test results 21failures / 109 tests 19.3%share of tests · 3 sources 2026-08-13latest lab result
Inside the lab evidence
Public preview21 failures in 109 applicable results from this vendor
RetatrutideExplore failed COAs8 / 27 failures / results
- At least 10% short 8
Largest measured shortfall 21.3%
BPC-157Explore failed COAs4 / 12 failures / results
- At least 10% short 4
Largest measured shortfall 53.2%
CJC-1295Explore failed COAs4 / 9 failures / results
- At least 10% short 4
Largest measured shortfall 17.1%
TB-500Explore failed COAs1 / 13 failures / results
- At least 10% short 1
Largest measured shortfall 14.2%
TesamorelinExplore failed COAs1 / 13 failures / results
- At least 10% short 1
Largest measured shortfall 10.7%
Explore all 8 compounds with failures
Showing 5 of 8 compound groups with failures. 4 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 identity hiddenExplore test results 19failures / 147 tests 12.9%share of tests · 1 source 2026-08-14latest lab result
Inside the lab evidence
Public preview19 failures in 147 applicable results from this vendor
EpithalonExplore failed COAs3 / 9 failures / results
- At least 10% short 3
Largest measured shortfall 39.64%
GHK-CuExplore failed COAs3 / 8 failures / results
- At least 10% short 3
Largest measured shortfall 22.2%
IpamorelinExplore failed COAs3 / 6 failures / results
- At least 10% short 3
Largest measured shortfall 37.2%
PT-141Explore failed COAs2 / 4 failures / results
- At least 10% short 2
Largest measured shortfall 37%
RetatrutideExplore failed COAs1 / 21 failures / results
- At least 10% short 1
Largest measured shortfall 36.27%
Explore all 12 compounds with failures
Showing 5 of 12 compound groups with failures. 109 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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09 Vendor identity hiddenExplore test results 18failures / 358 tests 5%share of tests · 1 source 2026-08-28latest lab result
Inside the lab evidence
Public preview18 failures in 358 applicable results from this vendor
Other compoundsExplore failed COAs2 / 37 failures / results
- At least 10% short 2
Largest measured shortfall 12.6%
NAD+Explore failed COAs2 / 20 failures / results
- At least 10% short 2
Largest measured shortfall 48.92%
SemaxExplore failed COAs2 / 12 failures / results
- At least 10% short 2
Largest measured shortfall 25.8%
RetatrutideExplore failed COAs1 / 36 failures / results
- At least 10% short 1
Largest measured shortfall 11.3%
TB-500Explore failed COAs1 / 19 failures / results
- At least 10% short 1
Largest measured shortfall 14.5%
Explore all 15 compounds with failures
Showing 5 of 15 compound groups with failures. 91 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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10 Limitless Life NootropicsExplore test results 18failures / 22 tests 81.8%share of tests · 1 source 2025-09-25latest lab result
Inside the lab evidence
Public preview18 failures in 22 applicable results from this vendor
CJC-1295Explore failed COAs6 / 8 failures / results
- At least 10% short 6
Largest measured shortfall 32%
BPC-157Explore failed COAs6 / 6 failures / results
- At least 10% short 6
Largest measured shortfall 28.5%
IpamorelinExplore failed COAs4 / 4 failures / results
- At least 10% short 4
Largest measured shortfall 23.2%
RetatrutideExplore failed COAs2 / 4 failures / results
- At least 10% short 2
Largest measured shortfall 26%
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.
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 →