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.

17,093 lab results102 vendors in the report-count rankingHow the rankings work →

Data refreshed Report dates are shown with each test.

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

761 recorded failures across 11,152 applicable results from 100 vendors.

5,941 other eligible records have no included result for this check. Missing and excluded measurements never count as passes.

5 failures belong to vendors with fewer than 10 applicable results, so those vendors are not ranked below.

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.

  1. 01 Vendor name available with ProExplore test results 79failures / 283 tests 27.9%share of tests · 3 sources 2026-10-08latest lab result

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    79 failures in 283 applicable results from this vendor

    RetatrutideExplore failed COAs18 / 73 failures / results
    • At least 10% short 18

    Largest measured shortfall 46%

    TirzepatideExplore failed COAs11 / 60 failures / results
    • At least 10% short 11

    Largest measured shortfall 22.2%

    SemaglutideExplore failed COAs11 / 22 failures / results
    • At least 10% short 11

    Largest measured shortfall 28%

    GHK-CuExplore failed COAs7 / 20 failures / results
    • At least 10% short 7

    Largest measured shortfall 26.7%

    BPC-157Explore failed COAs6 / 22 failures / results
    • At least 10% short 6

    Largest measured shortfall 17.6%

    Explore all 14 compounds with failures

    Showing 5 of 14 compound groups with failures. 31 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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  2. 02 Vendor name available with ProExplore test results 65failures / 536 tests 12.1%share of tests · 4 sources 2026-10-09latest lab result

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    65 failures in 536 applicable results from this vendor

    RetatrutideExplore failed COAs30 / 149 failures / results
    • At least 10% short 30

    Largest measured shortfall 26.2%

    TirzepatideExplore failed COAs16 / 113 failures / results
    • At least 10% short 16

    Largest measured shortfall 29.7%

    BPC-157Explore failed COAs5 / 29 failures / results
    • At least 10% short 5

    Largest measured shortfall 25.7%

    TesamorelinExplore failed COAs4 / 37 failures / results
    • At least 10% short 4

    Largest measured shortfall 31%

    CagrilintideExplore failed COAs3 / 22 failures / results
    • At least 10% short 3

    Largest measured shortfall 18.4%

    Explore all 11 compounds with failures

    Showing 5 of 11 compound groups with failures. 199 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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  3. 03 Vendor name available with ProExplore test results 29failures / 650 tests 4.5%share of tests · 1 source 2026-10-17latest lab result

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    29 failures in 650 applicable results from this vendor

    Other compoundsExplore failed COAs5 / 60 failures / results
    • At least 10% short 5

    Largest measured shortfall 43.5%

    KPVExplore failed COAs5 / 10 failures / results
    • At least 10% short 5

    Largest measured shortfall 15.7%

    GHRP-6Explore failed COAs3 / 4 failures / results
    • At least 10% short 3

    Largest measured shortfall 22.2%

    RetatrutideExplore failed COAs2 / 112 failures / results
    • At least 10% short 2

    Largest measured shortfall 48.4%

    MOTS-CExplore failed COAs2 / 37 failures / results
    • At least 10% short 2

    Largest measured shortfall 12.5%

    Explore all 14 compounds with failures

    Showing 5 of 14 compound groups with failures. 936 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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  4. 04 Vendor name available with ProExplore test results 29failures / 506 tests 5.7%share of tests · 4 sources 2026-10-16latest lab result

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    29 failures in 506 applicable results from this vendor

    Other compoundsExplore failed COAs9 / 104 failures / results
    • At least 10% short 9

    Largest measured shortfall 32.87%

    RetatrutideExplore failed COAs5 / 103 failures / results
    • At least 10% short 5

    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 / 14 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 11 compounds with failures

    Showing 5 of 11 compound groups with failures. 198 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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  5. 05 Vendor name available with ProExplore test results 27failures / 419 tests 6.4%share of tests · 1 source 2026-10-01latest lab result

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    27 failures in 419 applicable results from this vendor

    SemaglutideExplore failed COAs3 / 25 failures / results
    • At least 10% short 3

    Largest measured shortfall 12.6%

    SemaxExplore failed COAs3 / 14 failures / results
    • At least 10% short 3

    Largest measured shortfall 25.8%

    GHRP-2Explore failed COAs3 / 9 failures / results
    • At least 10% short 3

    Largest measured shortfall 17%

    NAD+Explore failed COAs2 / 23 failures / results
    • At least 10% short 2

    Largest measured shortfall 48.92%

    DSIPExplore failed COAs2 / 11 failures / results
    • At least 10% short 2

    Largest measured shortfall 16.5%

    Explore all 17 compounds with failures

    Showing 5 of 17 compound groups with failures. 106 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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  6. 06 Peptide PartnersExplore test results 27failures / 126 tests 21.4%share of tests · 3 sources 2026-10-14latest lab result

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    27 failures in 126 applicable results from this vendor

    RetatrutideExplore failed COAs12 / 34 failures / results
    • At least 10% short 12

    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 10 compounds with failures

    Showing 5 of 10 compound groups with failures. 20 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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  7. 07 Vendor name available with ProExplore test results 26failures / 520 tests 5%share of tests · 3 sources 2026-10-18latest lab result

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    26 failures in 520 applicable results from this vendor

    RetatrutideExplore failed COAs5 / 66 failures / results
    • At least 10% short 5

    Largest measured shortfall 28.3%

    Other compoundsExplore failed COAs3 / 75 failures / results
    • At least 10% short 3

    Largest measured shortfall 19%

    SemaglutideExplore failed COAs3 / 22 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 / 25 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. 194 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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  8. 08 Peptide GurusExplore test results 23failures / 160 tests 14.4%share of tests · 2 sources 2026-09-01latest lab result

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    23 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 / 21 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. 25 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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  9. 09 Vendor name available with ProExplore test results 21failures / 191 tests 11%share of tests · 1 source 2026-10-14latest lab result

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    21 failures in 191 applicable results from this vendor

    EpithalonExplore failed COAs3 / 10 failures / results
    • At least 10% short 3

    Largest measured shortfall 39.64%

    GHK-CuExplore failed COAs3 / 10 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 COAs3 / 6 failures / results
    • At least 10% short 3

    Largest measured shortfall 37%

    RetatrutideExplore failed COAs1 / 33 failures / results
    • At least 10% short 1

    Largest measured shortfall 36.27%

    Explore all 13 compounds with failures

    Showing 5 of 13 compound groups with failures. 131 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. 10 Limitless Life NootropicsExplore test results 18failures / 22 tests 81.8%share of tests · 1 source 2025-09-25latest lab result

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    18 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.

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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 →