Overall findings
Most lab-test failures
Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
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407 Hooked on Bioscience Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-10-16Latest test date< 1 year COA history 4% underdosed0% low purity 30 7
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423 Cellora Labs Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-10-10Latest test date< 1 year COA history 0% underdosed0% low purity 2 35
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409 Zhuoyue Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-10-06Latest test date1+ year COA history 9% low purity 28 9
Lab evidence
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408 AminoShoppe Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-26Latest test date< 1 year COA history 0% underdosed0% low purity 29 8
Lab evidence
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422 Moglabs Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-23Latest test date< 1 year COA history 4% underdosed0% low purity 3 34
Lab evidence
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410 Yabang Peptide Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-16Latest test date1+ year COA history 8% low purity 26 11
Lab evidence
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419 Panda Peptides Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-14Latest test date< 1 year COA history 13% underdosed0% low purity 9 28
Lab evidence
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405 Pure Pharm Peptides Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-13Latest test date< 1 year COA history 3% underdosed0% low purity 31 6
Lab evidence
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412 GhostLabz Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-03Latest test date< 1 year COA history 9% underdosed3% low purity 23 14
Lab evidence
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413 Noxa Labs Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-09-02Latest test date< 1 year COA history 0% underdosed0% low purity 20 17
Lab evidence
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417 Purepep Research Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-08-30Latest test date2+ years COA history 0% underdosed0% low purity 15 22
Lab evidence
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414 Peptiva Health Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-08-17Latest test date1+ year COA history 10% underdosed0% low purity 20 17
Lab evidence
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416 Steel Bison Labs Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-08-17Latest test date< 1 year COA history 0% underdosed0% low purity 19 18
Lab evidence
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411 NuRev Peptides Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-08-11Latest test date< 1 year COA history 4% underdosed0% low purity 26 11
Lab evidence
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418 PGB Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-08-06Latest test date1+ year COA history 0% underdosed2% low purity 15 22
Lab evidence
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415 Halo Peptides Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-07-27Latest test date< 1 year COA history 3% underdosed0% low purity 20 17
Lab evidence
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420 DRP PEPTIDES Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-07-25Latest test date< 1 year COA history 3% underdosed0% low purity 8 29
Lab evidence
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404 Shark-Line Peptide Company Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-07-01Latest test date< 1 year COA history 0% underdosed0% low purity 33 4
Lab evidence
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406 Shanghai Jinbei Chemical Technology Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-06-16Latest test date1+ year COA history 5% low purity 31 6
Lab evidence
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400 Superhuman Peptides Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-06-15Latest test date< 1 year COA history 3% underdosed0% low purity 37 0
Lab evidence
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401 ELJ Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-06-07Latest test date< 1 year COA history 20% underdosed0% low purity 37 0
Lab evidence
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402 TWYN Wellness Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2026-03-16Latest test date< 1 year COA history 7% underdosed5% low purity 37 0
Lab evidence
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403 Elixer Explore test results Seller type not reviewed No buyer reviews indexed 37Unique reports 2025-07-11Latest test date1+ year COA history 22% low purity 37 0
Lab evidence
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427 Peptide Society Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-10-01Latest test date1+ year COA history 0% underdosed0% low purity 30 6
Lab evidence
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428 Infinity Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-09-26Latest test date< 1 year COA history 9% underdosed0% low purity 24 12
Lab evidence
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429 Haikou Mingheng Technology Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-09-24Latest test date1+ year COA history 3% low purity1 endotoxin failure 24 12
Lab evidence
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432 Rhome Research Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-09-24Latest test date< 1 year COA history 17% underdosed0% low purity 12 24
Lab evidence
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431 The Collective Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-09-01Latest test date1+ year COA history 0% underdosed0% low purity 14 22
Lab evidence
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430 Global Aminos Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-08-13Latest test date1+ year COA history 4% underdosed0% low purity 22 14
Lab evidence
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426 JJ's Peptides Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-07-03Latest test date1+ year COA history 0% underdosed3% low purity 31 5
Lab evidence
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424 Alpha Pro Peptides Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-05-18Latest test date< 1 year COA history 0% underdosed0% low purity 36 0
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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425 Biogreen Peptides Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2026-05-18Latest test date< 1 year COA history 7% underdosed0% low purity 33 3
Lab evidence
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433 HUMAN LABS Explore test results Seller type not reviewed No buyer reviews indexed 36Unique reports 2022-10-15Latest test date5+ years COA history 0% underdosed 0 36
Lab evidence
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439 VialsWithBenefits Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-10-10Latest test date< 1 year COA history 0% underdosed0% low purity 10 25
Lab evidence
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440 Ascending Labs Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-10-09Latest test date< 1 year COA history 0% underdosed6% low purity 10 25
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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437 Rayshine Peptide Biochemicals Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-09-19Latest test date1+ year COA history 6% underdosed3% low purity 16 19
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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436 NextSelf Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-09-03Latest test date< 1 year COA history 3% underdosed0% low purity 18 17
Lab evidence
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438 Soma Research, LLC Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-09-01Latest test date< 1 year COA history 17% underdosed0% low purity 12 23
Lab evidence
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435 PC Peptides Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-08-26Latest test date< 1 year COA history 0% underdosed0% low purity 19 16
Lab evidence
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434 Longevity Pro Labs Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2026-07-06Latest test date< 1 year COA history 7% low purity 35 0
Lab evidence
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441 UGL OZ Explore test results Seller type not reviewed No buyer reviews indexed 35Unique reports 2023-11-14Latest test date3+ years COA history 25% low purity 2 33
Lab evidence
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445 L3 Compounds Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-10-12Latest test date< 1 year COA history 14% underdosed0% low purity 17 17
Lab evidence
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443 Super Peptides Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-10-06Latest test date< 1 year COA history 4% low purity 22 12
Lab evidence
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447 Longevity WS Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-10-01Latest test date< 1 year COA history 4% underdosed4% low purity 8 26
Lab evidence
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448 Permian Research Compounds Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-10-01Latest test date< 1 year COA history 0% underdosed0% low purity 6 28
Lab evidence
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442 Haikou Mingheng Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-09-21Latest test date1+ year COA history 9% low purity 27 7
Lab evidence
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446 ZJ Bio Labs Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-08-27Latest test date< 1 year COA history 0% underdosed0% low purity 15 19
Lab evidence
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449 AF PEPTIDES Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-08-18Latest test date< 1 year COA history 0% underdosed0% low purity 1 33
Lab evidence
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444 LumaPeptides Explore test results Seller type not reviewed No buyer reviews indexed 34Unique reports 2026-08-08Latest test date1+ year COA history 0% underdosed0% low purity 21 13
Lab evidence
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461 Retalux Explore test results Seller type not reviewed No buyer reviews indexed 33Unique reports 2026-10-16Latest test date< 1 year COA history 3% low purity 2 31
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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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
- 121,000
- 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 · 17,264 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 · 57,121 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.