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01 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 1,587Unique reports 2026-10-17Latest test date4+ years COA history 4% underdosed1% low purity 1,200 387
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01 Vendor name available with Pro Explore test results International vendor 389 buyer reviews 1,436Unique reports 2026-09-21Latest test date2+ years COA history 1% underdosed1% low purity4 endotoxin failures 1,165 271
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02 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 740Unique reports 2026-10-20Latest test date2+ years COA history 0% underdosed3% low purity 588 152
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03 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 717Unique reports 2026-10-20Latest test date1+ year COA history 3% underdosed2% low purity 572 145
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04 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 704Unique reports 2026-10-16Latest test date2+ years COA history 4% underdosed3% low purity 616 88
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05 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 633Unique reports 2026-10-20Latest test date1+ year COA history 3% underdosed1% low purity 517 116
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02 Vendor name available with Pro Explore test results International vendor 236 buyer reviews 617Unique reports 2026-10-06Latest test date4+ years COA history 5% underdosed17% low purity 509 108
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06 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 570Unique reports 2026-09-25Latest test date1+ year COA history 1% underdosed1% low purity 484 86
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03 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 547Unique reports 2026-10-20Latest test date2+ years COA history 0% underdosed2% low purity 479 68
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07 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 528Unique reports 2026-10-01Latest test date1+ year COA history 6% underdosed0% low purity 288 240
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08 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 526Unique reports 2026-09-29Latest test date1+ year COA history 4% underdosed1% low purity 342 184
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09 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 489Unique reports 2026-10-16Latest test date1+ year COA history 3% underdosed2% low purity 302 187
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10 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 421Unique reports 2026-10-05Latest test date1+ year COA history 5% underdosed1% low purity 375 46
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04 Vendor name available with Pro Explore test results International vendor 3 buyer reviews 388Unique reports 2026-10-09Latest test date1+ year COA history 23% underdosed6% low purity1 endotoxin failure 324 64
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11 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 385Unique reports 2026-07-23Latest test date3+ years COA history 7% underdosed1% low purity 71 314
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12 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 382Unique reports 2026-10-08Latest test date1+ year COA history 3% underdosed3% low purity 260 122
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05 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 355Unique reports 2026-10-12Latest test date1+ year COA history 0% underdosed1% low purity3 endotoxin failures 288 67
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06 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 354Unique reports 2026-09-18Latest test date2+ years COA history 3% underdosed8% low purity 280 74
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07 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 348Unique reports 2026-10-12Latest test date1+ year COA history 0% underdosed6% low purity 282 66
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13 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 338Unique reports 2026-10-18Latest test date1+ year COA history 0% underdosed1% low purity 228 110
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14 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 323Unique reports 2026-10-08Latest test date1+ year COA history 12% underdosed1% low purity 308 15
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15 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 322Unique reports 2026-10-14Latest test date1+ year COA history 11% underdosed<1% low purity 156 166
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01 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 318Unique reports 2026-10-02Latest test date1+ year COA history 4% underdosed<1% low purity 265 53
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02 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 312Unique reports 2026-09-28Latest test date1+ year COA history 3% underdosed1% low purity 207 105
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03 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 311Unique reports 2026-10-14Latest test date1+ year COA history 5% underdosed2% low purity 223 88
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08 Vendor name available with Pro Explore test results International vendor 2 buyer reviews 306Unique reports 2026-10-12Latest test date1+ year COA history 0% underdosed8% low purity 278 28
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04 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 304Unique reports 2026-10-16Latest test date1+ year COA history 7% underdosed0% low purity 249 55
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05 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 302Unique reports 2026-10-18Latest test date1+ year COA history 3% underdosed<1% low purity 181 121
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16 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 299Unique reports 2026-10-22Latest test date1+ year COA history 7% underdosed2% low purity 288 11
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17 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 294Unique reports 2026-10-20Latest test date2+ years COA history 9% underdosed5% low purity 216 78
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06 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 293Unique reports 2026-10-20Latest test date2+ years COA history 8% underdosed3% low purity2 endotoxin failures 213 80
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18 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 288Unique reports 2026-10-16Latest test date1+ year COA history 3% underdosed1% low purity 213 75
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07 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 285Unique reports 2026-10-19Latest test date< 1 year COA history 3% underdosed1% low purity 129 156
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08 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 281Unique reports 2026-10-12Latest test date1+ year COA history 0% underdosed2% low purity1 endotoxin failure 240 41
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09 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 281Unique reports 2026-10-03Latest test date2+ years COA history 3% underdosed1% low purity 193 88
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19 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 280Unique reports 2026-10-14Latest test date1+ year COA history 1% underdosed0% low purity 263 17
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09 Vendor name available with Pro Explore test results International vendor No buyer reviews indexed 266Unique reports 2026-10-01Latest test date2+ years COA history 0% underdosed2% low purity 207 59
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10 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 264Unique reports 2026-10-20Latest test date2+ years COA history 0% underdosed19% low purity 249 15
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10 Vendor name available with Pro Explore test results International vendor 34 buyer reviews 264Unique reports 2026-09-18Latest test date2+ years COA history 2% underdosed<1% low purity3 endotoxin failures 223 41
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11 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 257Unique reports 2026-10-21Latest test date1+ year COA history 1% underdosed0% low purity 150 107
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20 Vendor name available with Pro Explore test results U.S. reseller No buyer reviews indexed 257Unique reports 2026-06-08Latest test date2+ years COA history 6% underdosed4% low purity 243 14
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21 NextGen Peptides Explore test results U.S. reseller No buyer reviews indexed 255Unique reports 2026-09-23Latest test date1+ year COA history 1% underdosed2% low purity 253 2
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12 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 255Unique reports 2026-09-03Latest test date< 1 year COA history 4% underdosed2% low purity 187 68
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13 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 254Unique reports 2026-10-16Latest test date< 1 year COA history 3% underdosed2% low purity 155 99
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14 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 253Unique reports 2025-09-10Latest test date2+ years COA history 3% underdosed8% low purity 135 118
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15 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 244Unique reports 2026-02-24Latest test date6+ years COA history 5% underdosed33% low purity 16 228
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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22 Skye Peptides Explore test results U.S. reseller No buyer reviews indexed 241Unique reports 2026-09-29Latest test date1+ year COA history 0% underdosed7% low purity 217 24
Lab evidence
Free previewExplore this vendor’s lab reports
Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
16 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 233Unique reports 2026-10-16Latest test date1+ year COA history 3% underdosed1% low purity 199 34
Lab evidence
Free previewExplore this vendor’s lab reports
Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
Which vendor is this?
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17 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 232Unique reports 2026-09-24Latest test date2+ years COA history 0% underdosed15% low purity 223 9
Lab evidence
Free previewExplore this vendor’s lab reports
Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
Which vendor is this?
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23 Biolongevity Labs Explore test results U.S. reseller No buyer reviews indexed 231Unique reports 2026-10-20Latest test date1+ year COA history 6% underdosed1% low purity 228 3
Lab evidence
Free previewExplore this vendor’s lab reports
Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
More reports means more evidence to inspect, not better quality. Each report counts once. Purity and amount percentages require at least five applicable results; explicit endotoxin failures are always shown. Missing measurements are not passes.
Understand the coverage
- Published COA report entries
- 120,981
- Ranked vendors across all seller groups
- 3,071
- Index refresh
Report dates are shown with each test. International classification does not establish factory ownership. U.S. resale does not establish U.S. manufacture.
The first 20 identities in each seller group’s original report-count ranking are shown to signed-in members. Changing the sort order does not change access. Vendors ranked 21 and below in those rankings remain named.
- International vendors
- 30 reviewed vendors · 7,704 unique reports · 19 observed in 30 days
- Compare manufacturers, exporters and other international sellers by their independent lab reports.
- Domestic resellers
- 102 reviewed vendors · 17,266 unique reports · 41 observed in 30 days
- Compare U.S.-based resellers. The seller is domestic; the product may still come from an overseas supplier.
- Seller type not reviewed
- 2,939 vendors · 57,122 unique reports · 363 observed in 30 days
- Sellers with independent lab reports whose seller type we have not reviewed yet.
Each report counts once, even when it tests several compounds or appears in multiple archives. Purity and dose results describe submitted samples, not everything a vendor sells. The methodology and known limitations explain eligibility and exclusions.
Explore recorded findings and compound comparisons
What is a domestic reseller?
A reseller buys from another supplier and sells under its own storefront or brand. Here, domestic means U.S.-based. Local shipping does not mean the product was made in the U.S. or tested after resale. Check the report for the actual batch.
Follow the evidence
Where the tests went wrong.
Recorded failures alongside the number of applicable tests. Choose a seller group to see the results behind each count.
Contamination findings
Failed endotoxin tests
Compare repeated failures in tests for bacterial endotoxins.
Below 97% purity
Low purity results
Vendors with the most measured purity results below 97%.
At least 10% short
Underfilled samples
See where tests found less compound than the stated amount.
Identity findings
Compound not found
Vendors with the most results that did not find the labeled compound.
What these counts include
All available results in the lab-findings comparisons. Each category counts only applicable tests; missing measurements do not count as passes. One sample can appear in several categories, but counts once in the overall total. These are counts of tested samples, not failure rates for everything a vendor sells.
International vendors: Recorded lab dates 2022-06-24 to 2026-10-20. 24 measured results have no usable date.
Domestic resellers: Recorded lab dates 2020-01-31 to 2026-10-22. 143 measured results have no usable date.
Choose your compound
Compare lab results
by compound.
Explore measured results, compare vendors and open their lab reports. These figures cover the same reviewed seller groups as the findings above.
GLP-1 and related compounds
RetatrutideLab results by vendor↗ International vendors1,779 measured results11.2–100% purity in 1,714 results Domestic resellers2,067 measured results33.7–100% purity in 1,915 results TirzepatideLab results by vendor↗ International vendors1,282 measured results40.4–100% purity in 1,248 results Domestic resellers1,436 measured results55.9–100% purity in 1,332 resultsGrowth hormone and related compounds
HGHLab results by vendor↗ International vendors79 measured results90.45–99.9% purity in 76 results Domestic resellers9 measured results96.14–99.84% purity in 9 results TesamorelinLab results by vendor↗ International vendors400 measured results12.7–100% purity in 380 results Domestic resellers582 measured results48.94–99.99% purity in 525 resultsRanges include measured purity above 0%. “Compound not found” is counted separately. The report library has broader coverage; vendor rankings apply their own minimum test counts.
Beyond the lab
What was it like to order?
Buyer reviews cover delivery, communication and service. Each keeps its date and source.