Overall findings
Most lab-test failures
Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
Review testing histories, buyer reports and recorded concerns in one directory.
1171 PEPRALLY.BIO Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-06-09Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
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1194 GLAMPEPTIDES Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-06-09Latest test date< 1 year COA history 0% underdosed0% low purity 10 1
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1172 ProHealth Peptides USA Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-06-08Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1173 Next Peptide Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-06-07Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1174 Pro Peptide Shop Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-27Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1175 League Research Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-24Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1176 Betterday Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1177 Combat Research Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
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1178 Synapse Peptide Sciences Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-16Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
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1179 PeptideX.ca Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-14Latest test date< 1 year COA history 0% low purity 11 0
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1195 PureChain Aminos Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-05-14Latest test date< 1 year COA history 17% underdosed0% low purity 10 1
Lab evidence
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1196 Amino Club Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-04-26Latest test date< 1 year COA history 12% underdosed0% low purity 10 1
Lab evidence
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1180 Eqnx Labs Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-04-14Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1181 Longev Research Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-04-14Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1182 Neurogan / Stemcode Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-04-12Latest test date< 1 year COA history 33% underdosed9% low purity 11 0
Lab evidence
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1199 PureLux Bio Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-03-27Latest test date< 1 year COA history 11% underdosed0% low purity 9 2
Lab evidence
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1183 Stemcode Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-03-23Latest test date< 1 year COA history 17% underdosed0% low purity 11 0
Lab evidence
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1228 Chilton Labs / www.chiltonlabs.ru Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-03-05Latest test date< 1 year COA history 0% low purity 0 11
Lab evidence
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1184 Pattern Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-02-28Latest test date< 1 year COA history 0% low purity 11 0
Lab evidence
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1185 Snap Peptides Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-02-25Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1186 Alpha Amino Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-02-17Latest test date< 1 year COA history 14% underdosed0% low purity 11 0
Lab evidence
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1187 Shenzhen Jiacheng YiFeng Tech Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-02-14Latest test date< 1 year COA history 0% underdosed0% low purity 11 0
Lab evidence
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1188 Reset Biology Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-02-01Latest test date1+ year COA history 0% low purity 11 0
Lab evidence
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1204 P3 Labz Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2026-01-29Latest test date1+ year COA history 0% low purity 8 3
Lab evidence
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1189 Clarity Compounds Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-12-12Latest test date< 1 year COA history 10% underdosed0% low purity 11 0
Lab evidence
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1229 BIOAMINO LABS Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-12-11Latest test date4+ years COA history 0% underdosed27% low purity 0 11
Lab evidence
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1230 Werner Science Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-11-26Latest test date1+ year COA history 0% underdosed0% low purity 0 11
Lab evidence
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1190 Peak Performance Health Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-09-19Latest test date1+ year COA history 0% low purity 11 0
Lab evidence
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1191 Clinova Solutions LLC Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-09-03Latest test date1+ year COA history 9% low purity 11 0
Lab evidence
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1231 Zhuzhou Lusong Zhongtuo(ZLZ peptides) Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-06-16Latest test date2+ years COA history 0% underdosed9% low purity 0 11
Lab evidence
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1232 Idenex Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2025-02-25Latest test date3+ years COA history 0% low purity 0 11
Lab evidence
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1205 ABC NO LABEL Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2024-11-05Latest test date2+ years COA history Fewer than 5 applicable tests 8 3
Lab evidence
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1233 Vida Labz Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2024-08-19Latest test date2+ years COA history 0% underdosed27% low purity 0 11
Lab evidence
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1234 FORZA PHARMA Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2023-05-05Latest test date3+ years COA history 0% underdosed 0 11
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1235 ARENIS MEDICO Explore test results Seller type not reviewed No buyer reviews indexed 11Unique reports 2021-02-17Latest test date6+ years COA history Fewer than 5 applicable tests 0 11
Lab evidence
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1299 Group Buy Kits Gbk Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-20Latest test date< 1 year COA history 0% low purity 0 10
Lab evidence
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1280 GPEC Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-19Latest test date< 1 year COA history 0% underdosed0% low purity 5 5
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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1284 Yk Nuoao Peptide Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-16Latest test date< 1 year COA history 10% low purity 4 6
Lab evidence
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1293 No Shot Research Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-14Latest test date< 1 year COA history 0% underdosed 2 8
Lab evidence
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1285 Guangzhou Yunyu Trading Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-08Latest test date< 1 year COA history 17% low purity 4 6
Lab evidence
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1290 Qingfuji Trading Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-06Latest test date< 1 year COA history 0% low purity 3 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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1300 Medi Peptide Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-05Latest test date< 1 year COA history 0% low purity 0 10
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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1301 Tirz Peptide Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-05Latest test date< 1 year COA history 20% low purity 0 10
Lab evidence
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1271 Xianhong Tong Xht Peptides Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-10-01Latest test date1+ year COA history 0% low purity 8 2
Lab evidence
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1236 Aethelcore | EU Domestic Stock | Fast Shipping 2-5Days Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-30Latest test date< 1 year COA history 0% underdosed0% low purity 10 0
Lab evidence
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1275 Elystra Bio Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-17Latest test date< 1 year COA history 0% underdosed0% low purity 7 3
Lab evidence
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1302 Bionexis Peptides Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-14Latest test date< 1 year COA history 0% low purity 0 10
Lab evidence
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1281 Helixbridge Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-07Latest test date< 1 year COA history 40% underdosed0% low purity 5 5
Lab evidence
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1266 D3 Peptide Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-05Latest test date< 1 year COA history 11% underdosed0% low purity 9 1
Lab evidence
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1267 PeptiCore Labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 10Unique reports 2026-09-05Latest test date< 1 year COA history 20% underdosed17% low purity 9 1
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
- 121,172
- 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.