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.
1936 Lux Labs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-21Latest test date< 1 year COA history Fewer than 5 applicable tests 2 2
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1937 Onebio Research Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-19Latest test date< 1 year COA history Fewer than 5 applicable tests 2 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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1981 Shaanxi Xianhe Biotech Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-12Latest test date< 1 year COA history Fewer than 5 applicable tests 0 4
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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1982 True Signature Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-12Latest test date< 1 year COA history Fewer than 5 applicable tests 0 4
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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1912 R&L Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-09Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1913 AK Aminos Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-08Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1938 The Way Bio Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-06Latest test date< 1 year COA history Fewer than 5 applicable tests 2 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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1914 DiPex Bio Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-05Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1939 Skytop Aminos, LLC Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-01Latest test date< 1 year COA history Fewer than 5 applicable tests 2 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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1952 Huai'an Dinglin Trading Co., Ltd. Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 3
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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1953 Pep of Life Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-08-01Latest test date< 1 year COA history Fewer than 5 applicable tests 1 3
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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1915 Onyx BioLabs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-31Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1940 CA RESEARCH SHOP Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-30Latest test date< 1 year COA history Fewer than 5 applicable tests 2 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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1954 Northstar Compounds Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-30Latest test date< 1 year COA history Fewer than 5 applicable tests 1 3
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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1916 AK BioMaxxing Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-28Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1917 Island Wellness and Recovery Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-28Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1941 Jaxtri Labs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-27Latest test date< 1 year COA history Fewer than 5 applicable tests 2 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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1955 Utah Peptide LLC Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-25Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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.
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1813 Apex Pharma.io Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-24Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1956 NanoAminos Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-21Latest test date< 1 year COA history Fewer than 5 applicable tests 1 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.
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1983 Dh Peps Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-20Latest test date< 1 year COA history Fewer than 5 applicable tests 0 4
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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1957 JAZA Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-17Latest test date< 1 year COA history Fewer than 5 applicable tests 1 3
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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1984 Sys Pharma Corp Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-13Latest test date< 1 year COA history Fewer than 5 applicable tests 0 4
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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1918 AAA Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-11Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1919 Flow Research Labs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-09Latest test date< 1 year COA history Fewer than 5 applicable tests 3 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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1814 Southern Cross Labs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-03Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1815 Lifelab Ventures LLC Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1816 Locus Research Labs Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-07-01Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1817 OLYXIR Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-30Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1818 Bordertwon Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-26Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1819 G2 (G Squared) Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-26Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1820 KinetiX Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-26Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1821 MYRRH Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-26Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1985 Nanjing Peptide Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-26Latest test date< 1 year COA history Fewer than 5 applicable tests 0 4
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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1822 Pinnacle Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-25Latest test date1+ year COA history Fewer than 5 applicable tests 4 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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1823 VIRTUS Global Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-22Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1824 PeakTide Solutions Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-21Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1825 VisPep Research Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-20Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1826 MC Peps Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-17Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1827 Suretide LLC Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-17Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1942 Zhuoyan Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-16Latest test date< 1 year COA history Fewer than 5 applicable tests 2 2
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.
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1828 BioPeptide Laboratory Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-15Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1829 High Tide Sciences Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-15Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1830 LUNA Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-15Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1831 GF Test Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-14Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1832 Apex Lab Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-12Latest test date< 1 year COA history Fewer than 5 applicable tests 4 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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1833 Heron Health - Elite Peptide Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-12Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1834 South OC Peptides Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-12Latest test date< 1 year COA history Fewer than 5 applicable tests 4 0
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.
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1920 Amino Life Sciences Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-12Latest test date< 1 year COA history Fewer than 5 applicable tests 3 1
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.
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1921 Synthera Peptides | syntherapeptides.store Explore test results Seller type not reviewed No buyer reviews indexed 4Unique reports 2026-06-08Latest test date< 1 year COA history Fewer than 5 applicable tests 3 1
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.
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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
- 121,165
- 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.