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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1478 Rock Ready Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-20Latest test date< 1 year COA history 0% low purity 7 0
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1479 Gaia Peptides Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-17Latest test date< 1 year COA history 0% low purity 7 0
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1521 Peppers and More Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-14Latest test date< 1 year COA history 0% underdosed0% low purity 4 3
Lab evidence
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1522 Graypep Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-13Latest test date< 1 year COA history 0% low purity 4 3
Lab evidence
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1480 Aurovita Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-11Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1481 Blue Atlas Biologix Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-08Latest test date< 1 year COA history Fewer than 5 applicable tests 7 0
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1482 Aminonexlabs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-05-06Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
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1483 Xingtai Pukelai Technology Co Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-04-28Latest test date1+ year COA history 0% low purity 7 0
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1484 Atlantic Aminos Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-04-19Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
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1546 ck peptides Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-04-15Latest test date1+ year COA history 0% underdosed0% low purity 1 6
Lab evidence
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1515 PureLuxe Bio Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-04-12Latest test date< 1 year COA history 0% underdosed0% low purity 5 2
Lab evidence
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1541 Nuvion Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-04-09Latest test date< 1 year COA history 0% low purity 2 5
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1485 Kimera Chem Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-29Latest test date< 1 year COA history 0% low purity 7 0
Lab evidence
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1530 Ephesians 613 Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-20Latest test date< 1 year COA history 0% underdosed0% low purity 3 4
Lab evidence
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1486 Quantum Biogenix Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-06Latest test date< 1 year COA history 29% underdosed0% low purity 7 0
Lab evidence
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1523 Wuhan Hongyoujie Hyj Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-06Latest test date< 1 year COA history 0% low purity 4 3
Lab evidence
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1524 Rr Biohakr Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-03Latest test date< 1 year COA history 0% low purity 4 3
Lab evidence
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1525 Zhejiang Jiuzhou Chem Co Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-03-02Latest test date1+ year COA history 0% low purity 4 3
Lab evidence
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1487 HGP Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-26Latest test date< 1 year COA history 0% low purity 7 0
Lab evidence
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1488 Cellular Advantage Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-22Latest test date< 1 year COA history 0% low purity 7 0
Lab evidence
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1489 Intergalactic Technologies LLC Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-17Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1490 Peptide Paradise Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-14Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1531 Forged Pharma Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-13Latest test date< 1 year COA history Fewer than 5 applicable tests 3 4
Lab evidence
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1526 Qingdao Hongshengda Trading Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-11Latest test date1+ year COA history 0% low purity 4 3
Lab evidence
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1491 LN Peptide Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-02-07Latest test date1+ year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1492 Bayside Peptides Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-01-26Latest test date< 1 year COA history 0% low purity 7 0
Lab evidence
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1493 A.R.N Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-01-21Latest test date< 1 year COA history 0% underdosed 7 0
Lab evidence
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1494 Game Changer Peptides Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-01-19Latest test date< 1 year COA history 0% low purity 7 0
Lab evidence
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1495 Biopharma Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2026-01-13Latest test date< 1 year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1559 TEKKO Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-12-22Latest test date1+ year COA history Fewer than 5 applicable tests 0 7
Lab evidence
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1560 EliteBiogenix.com Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-12-16Latest test date1+ year COA history 20% underdosed0% low purity 0 7
Lab evidence
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1496 zlzpeptide.com Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-11-21Latest test date< 1 year COA history 0% underdosed 7 0
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1497 Core Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-09-30Latest test date1+ year COA history 0% low purity 7 0
Lab evidence
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1561 www.asteroids.com Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-09-30Latest test date1+ year COA history Fewer than 5 applicable tests 0 7
Lab evidence
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1562 Raw Pharma Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-09-01Latest test date2+ years COA history Fewer than 5 applicable tests 0 7
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1498 D & F Research Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-08-27Latest test date1+ year COA history 0% underdosed0% low purity 7 0
Lab evidence
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1499 yuraPeptide Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-06-24Latest test date2+ years COA history Fewer than 5 applicable tests 7 0
Lab evidence
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1563 Oasis Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-05-13Latest test date2+ years COA history 0% underdosed0% low purity 0 7
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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1500 Source 1 Peptides Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-04-15Latest test date1+ year COA history 0% low purity 7 0
Lab evidence
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1501 ASC Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-02-07Latest test date1+ year COA history 6% underdosed0% low purity 7 0
Lab evidence
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1564 HAPPYPEPTIDES.COM Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2025-02-06Latest test date1+ year COA history 0% low purity 0 7
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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1565 Gideon Pharma Limited Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2024-06-07Latest test date2+ years COA history Fewer than 5 applicable tests 0 7
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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1502 Big Boy Labs Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2024-05-10Latest test date2+ years COA history Fewer than 5 applicable tests 7 0
Lab evidence
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1566 biogenpharmashop.com Explore test results Seller type not reviewed No buyer reviews indexed 7Unique reports 2023-02-04Latest test date3+ years COA history Fewer than 5 applicable tests 0 7
Lab evidence
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99 Virtus Peptides Explore test results U.S. reseller No buyer reviews indexed 7Unique reports —Latest test dateCOA history not recorded Fewer than 5 applicable tests 7 0
Lab evidence
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1662 Boruimei Explore test results Seller type not reviewed No buyer reviews indexed 6Unique reports 2026-10-20Latest test date< 1 year COA history Fewer than 5 applicable tests 0 6
Lab evidence
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1637 Atlas Labs Explore test results Seller type not reviewed No buyer reviews indexed 6Unique reports 2026-10-19Latest test date< 1 year COA history 0% underdosed0% low purity 3 3
Lab evidence
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1655 Arctic Lab Supply Explore test results Seller type not reviewed No buyer reviews indexed 6Unique reports 2026-10-15Latest test date< 1 year COA history 20% underdosed0% low purity 1 5
Lab evidence
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1663 Hkpep Explore test results Seller type not reviewed No buyer reviews indexed 6Unique reports 2026-10-13Latest test date< 1 year COA history 0% low purity 0 6
Lab evidence
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1630 PROVYN Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 6Unique reports 2026-10-10Latest test date< 1 year COA history 0% low purity 4 2
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
- 121,181
- 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 · 7,735 unique reports · 20 observed in 30 days
- Compare manufacturers, exporters and other international sellers by their independent lab reports.
- Domestic resellers
- 102 reviewed vendors · 17,278 unique reports · 44 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 · 57,179 unique reports · 353 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 2026-10-27. 24 measured results have no usable date.
Domestic resellers: Recorded lab dates 2020-01-31 to 2026-10-27. 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 vendors1,792 measured results11.2–100% purity in 1,726 results Domestic resellers2,076 measured results33.7–100% purity in 1,924 results TirzepatideLab results by vendor↗ International vendors1,288 measured results40.4–100% purity in 1,254 results Domestic resellers1,438 measured results55.9–100% purity in 1,334 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 vendors403 measured results12.7–100% purity in 383 results Domestic resellers583 measured results48.94–99.99% purity in 526 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.