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

Low purity results

Counts measured purity above 0% and below 97%. A result where the labeled compound was not found belongs in the identity category, not the purity average.

Across domestic resellers in this comparison

272 recorded failures across 14,002 applicable results from 101 vendors.

3,091 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: 2026-10-18. 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 18failures / 529 tests 3.4%share of tests · 4 sources 2026-10-16latest lab result

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    18 failures in 529 applicable results from this vendor

    Other compoundsExplore failed COAs4 / 87 failures / results
    • Purity below 97% 4

    Lowest measured purity 9.64%

    CJC-1295 w/ DACExplore failed COAs4 / 5 failures / results
    • Purity below 97% 4

    Lowest measured purity 31.94%

    NAD+Explore failed COAs2 / 8 failures / results
    • Purity below 97% 2

    Lowest measured purity 93.6%

    IGF-1 LR3Explore failed COAs2 / 3 failures / results
    • Purity below 97% 2

    Lowest measured purity 92.27%

    RetatrutideExplore failed COAs1 / 106 failures / results
    • Purity below 97% 1

    Lowest measured purity 92.48%

    Explore all 10 compounds with failures

    Showing 5 of 10 compound groups with failures. 175 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 17failures / 593 tests 2.9%share of tests · 4 sources 2026-10-09latest lab result

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    17 failures in 593 applicable results from this vendor

    RetatrutideExplore failed COAs5 / 157 failures / results
    • Purity below 97% 5

    Lowest measured purity 93.97%

    CJC-1295Explore failed COAs5 / 13 failures / results
    • Purity below 97% 5

    Lowest measured purity 91.99%

    TesamorelinExplore failed COAs3 / 41 failures / results
    • Purity below 97% 3

    Lowest measured purity 63.84%

    SemaglutideExplore failed COAs2 / 22 failures / results
    • Purity below 97% 2

    Lowest measured purity 95.5%

    CagrilintideExplore failed COAs1 / 26 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.9%

    Explore all 6 compounds with failures

    Showing 5 of 6 compound groups with failures. 142 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 14failures / 659 tests 2.1%share of tests · 3 sources 2026-10-18latest lab result

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    14 failures in 659 applicable results from this vendor

    Other compoundsExplore failed COAs9 / 99 failures / results
    • Purity below 97% 9

    Lowest measured purity 58.8%

    CJC-1295Explore failed COAs2 / 11 failures / results
    • Purity below 97% 2

    Lowest measured purity 96.33%

    NAD+Explore failed COAs1 / 27 failures / results
    • Purity below 97% 1

    Lowest measured purity 94.53%

    AOD-9604Explore failed COAs1 / 13 failures / results
    • Purity below 97% 1

    Lowest measured purity 87.76%

    HCGExplore failed COAs1 / 2 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.87%

    55 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 Peptide GurusExplore test results 12failures / 149 tests 8.1%share of tests · 2 sources 2026-09-01latest lab result

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    12 failures in 149 applicable results from this vendor

    BPC-157Explore failed COAs4 / 16 failures / results
    • Purity below 97% 4

    Lowest measured purity 96.21%

    TirzepatideExplore failed COAs3 / 20 failures / results
    • Purity below 97% 3

    Lowest measured purity 96.46%

    CJC-1295Explore failed COAs3 / 8 failures / results
    • Purity below 97% 3

    Lowest measured purity 96.21%

    TesamorelinExplore failed COAs1 / 4 failures / results
    • Purity below 97% 1

    Lowest measured purity 86.38%

    HGHExplore failed COAs1 / 1 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.63%

    36 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 11failures / 209 tests 5.3%share of tests · 3 sources 2026-10-06latest lab result

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    11 failures in 209 applicable results from this vendor

    CJC-1295Explore failed COAs6 / 11 failures / results
    • Purity below 97% 6

    Lowest measured purity 68.75%

    BPC-157Explore failed COAs3 / 16 failures / results
    • Purity below 97% 3

    Lowest measured purity 95.29%

    AOD-9604Explore failed COAs2 / 5 failures / results
    • Purity below 97% 2

    Lowest measured purity 88.19%

    84 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 Nuscience PeptidesExplore test results 10failures / 131 tests 7.6%share of tests · 2 sources 2026-10-09latest lab result

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    10 failures in 131 applicable results from this vendor

    RetatrutideExplore failed COAs3 / 19 failures / results
    • Purity below 97% 3

    Lowest measured purity 93.68%

    CJC-1295Explore failed COAs3 / 5 failures / results
    • Purity below 97% 3

    Lowest measured purity 80.79%

    SemaglutideExplore failed COAs2 / 16 failures / results
    • Purity below 97% 2

    Lowest measured purity 95.91%

    MazdutideExplore failed COAs2 / 3 failures / results
    • Purity below 97% 2

    Lowest measured purity 93.17%

    9 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 Limitless Life NootropicsExplore test results 10failures / 22 tests 45.5%share of tests · 1 source 2025-09-25latest lab result

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    10 failures in 22 applicable results from this vendor

    CJC-1295Explore failed COAs8 / 8 failures / results
    • Purity below 97% 8

    Lowest measured purity 91.27%

    IpamorelinExplore failed COAs2 / 4 failures / results
    • Purity below 97% 2

    Lowest measured purity 96.54%

    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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  8. 08 Vendor name available with ProExplore test results 9failures / 1,215 tests 0.7%share of tests · 1 source 2026-10-17latest lab result

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    9 failures in 1,215 applicable results from this vendor

    Other compoundsExplore failed COAs5 / 219 failures / results
    • Purity below 97% 5

    Lowest measured purity 95.32%

    RetatrutideExplore failed COAs1 / 127 failures / results
    • Purity below 97% 1

    Lowest measured purity 49.94%

    BPC-157 + TB-500Explore failed COAs1 / 34 failures / results
    • Purity below 97% 1

    Lowest measured purity 91.75%

    Thymosin Alpha-1Explore failed COAs1 / 20 failures / results
    • Purity below 97% 1

    Lowest measured purity 93.18%

    TB-500 + TesamorelinExplore failed COAs1 / 1 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.88%

    371 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 9failures / 340 tests 2.6%share of tests · 2 sources 2026-10-08latest lab result

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    9 failures in 340 applicable results from this vendor

    SNAP-8Explore failed COAs4 / 7 failures / results
    • Purity below 97% 4

    Lowest measured purity 95.88%

    GHK-CuExplore failed COAs1 / 25 failures / results
    • Purity below 97% 1

    Lowest measured purity 49.92%

    CJC-1295Explore failed COAs1 / 6 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.72%

    CJC-1295 + IpamorelinExplore failed COAs1 / 5 failures / results
    • Purity below 97% 1

    Lowest measured purity 95.92%

    AHK-CuExplore failed COAs1 / 3 failures / results
    • Purity below 97% 1

    Lowest measured purity 49.94%

    Explore all 6 compounds with failures

    Showing 5 of 6 compound groups with failures. 43 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 Skye PeptidesExplore test results 9failures / 125 tests 7.2%share of tests · 4 sources 2026-09-29latest lab result

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    9 failures in 125 applicable results from this vendor

    BPC-157Explore failed COAs3 / 20 failures / results
    • Purity below 97% 3

    Lowest measured purity 95.43%

    TesamorelinExplore failed COAs3 / 10 failures / results
    • Purity below 97% 3

    Lowest measured purity 83.84%

    RetatrutideExplore failed COAs1 / 18 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.12%

    IpamorelinExplore failed COAs1 / 8 failures / results
    • Purity below 97% 1

    Lowest measured purity 94.53%

    TB-500Explore failed COAs1 / 4 failures / results
    • Purity below 97% 1

    Lowest measured purity 94.04%

    116 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 →