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.

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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

253 recorded failures across 12,724 applicable results from 100 vendors.

2,881 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.

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  1. 01 Vendor identity hiddenExplore test results 18failures / 502 tests 3.6%share of tests · 4 sources 2026-08-23latest lab result

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    18 failures in 502 applicable results from this vendor

    Other compoundsExplore failed COAs4 / 123 failures / results
    • Purity below 97% 4

    Lowest measured purity 9.64%

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

    Lowest measured purity 31.94%

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

    Lowest measured purity 93.6%

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

    Lowest measured purity 92.27%

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    RetatrutideExplore failed COAs1 / 71 failures / results
    • Purity below 97% 1

    Lowest measured purity 92.48%

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    Explore all 10 compounds with failures
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    Showing 5 of 10 compound groups with failures. 158 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 identity hiddenExplore test results 16failures / 563 tests 2.8%share of tests · 4 sources 2026-08-13latest lab result

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    16 failures in 563 applicable results from this vendor

    RetatrutideExplore failed COAs5 / 154 failures / results
    • Purity below 97% 5

    Lowest measured purity 93.97%

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    CJC-1295Explore failed COAs5 / 12 failures / results
    • Purity below 97% 5

    Lowest measured purity 91.99%

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    TesamorelinExplore failed COAs3 / 39 failures / results
    • Purity below 97% 3

    Lowest measured purity 63.84%

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

    Lowest measured purity 95.5%

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    CagrilintideExplore failed COAs1 / 25 failures / results
    • Purity below 97% 1

    Lowest measured purity 96.9%

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    139 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 identity hiddenExplore test results 14failures / 589 tests 2.4%share of tests · 2 sources 2026-08-30latest lab result

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    14 failures in 589 applicable results from this vendor

    Other compoundsExplore failed COAs9 / 100 failures / results
    • Purity below 97% 9

    Lowest measured purity 58.8%

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    CJC-1295Explore failed COAs2 / 10 failures / results
    • Purity below 97% 2

    Lowest measured purity 96.33%

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    NAD+Explore failed COAs1 / 22 failures / results
    • Purity below 97% 1

    Lowest measured purity 94.53%

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

    Lowest measured purity 87.76%

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

    Lowest measured purity 96.87%

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    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%

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

    Lowest measured purity 96.46%

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

    Lowest measured purity 96.21%

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

    Lowest measured purity 86.38%

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

    Lowest measured purity 96.63%

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    35 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 identity hiddenExplore test results 11failures / 206 tests 5.3%share of tests · 3 sources 2026-08-27latest lab result

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    11 failures in 206 applicable results from this vendor

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

    Lowest measured purity 68.75%

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    BPC-157Explore failed COAs3 / 15 failures / results
    • Purity below 97% 3

    Lowest measured purity 95.29%

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

    Lowest measured purity 88.19%

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    77 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 / 127 tests 7.9%share of tests · 2 sources 2026-07-23latest lab result

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    10 failures in 127 applicable results from this vendor

    RetatrutideExplore failed COAs3 / 18 failures / results
    • Purity below 97% 3

    Lowest measured purity 93.68%

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

    Lowest measured purity 80.79%

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    SemaglutideExplore failed COAs2 / 13 failures / results
    • Purity below 97% 2

    Lowest measured purity 95.91%

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

    Lowest measured purity 93.17%

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    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%

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

    Lowest measured purity 96.54%

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    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 identity hiddenExplore test results 9failures / 1,092 tests 0.8%share of tests · 1 source 2026-08-29latest lab result

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    9 failures in 1,092 applicable results from this vendor

    Other compoundsExplore failed COAs5 / 222 failures / results
    • Purity below 97% 5

    Lowest measured purity 95.32%

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    RetatrutideExplore failed COAs1 / 116 failures / results
    • Purity below 97% 1

    Lowest measured purity 49.94%

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

    Lowest measured purity 91.75%

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    Thymosin Alpha-1Explore failed COAs1 / 19 failures / results
    • Purity below 97% 1

    Lowest measured purity 93.18%

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

    Lowest measured purity 96.88%

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    364 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 Amino AmigosExplore test results 9failures / 37 tests 24.3%share of tests · 1 source 2025-07-16latest lab result

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    9 failures in 37 applicable results from this vendor

    CJC-1295Explore failed COAs6 / 7 failures / results
    • Purity below 97% 6

    Lowest measured purity 73.24%

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    TirzepatideExplore failed COAs3 / 8 failures / results
    • Purity below 97% 3

    Lowest measured purity 96.6%

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    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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  10. 10 Vendor identity hiddenExplore test results 8failures / 391 tests 2%share of tests · 2 sources 2026-08-27latest lab result

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    8 failures in 391 applicable results from this vendor

    Other compoundsExplore failed COAs6 / 63 failures / results
    • Purity below 97% 6

    Lowest measured purity 94.49%

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    CJC-1295 + IpamorelinExplore failed COAs1 / 13 failures / results
    • Purity below 97% 1

    Lowest measured purity 94.63%

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    TB-500Explore failed COAs1 / 11 failures / results
    • Purity below 97% 1

    Lowest measured purity 92.86%

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    18 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: 2026-09-01. Method and limitations →