International peptide vendors
International vendors.
Ranked by lab reports.
Compare unique reports and measured results from reviewed international sellers. More reports means more evidence to examine; rank does not measure quality.
Data refreshed Report dates are shown with each test.
The leading three
Top of the leaderboard.
Ranked by unique lab reports.
See the results behind each position.
Underdosed means at least 10% below the label; low purity means below 97%. Rates use applicable tests, which can differ from unique report counts. Report count does not establish product quality. COA history estimates time since the earliest dated report in our records; a vendor may have operated longer. Vendor names are shown to signed-in members.
International peptide vendor rankings
Vendors with the most lab reports
Ranks 1–30 of 30. Open a row to explore compounds and certificates.
01 Vendor name available with Pro Explore test results 389 buyer reviews 1,436Unique reports 2026-09-21Last observed2+ years COA history 1% underdosed1% low purity4 endotoxin failures 1,165 271
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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02 Vendor name available with Pro Explore test results 236 buyer reviews 616Unique reports 2026-10-06Last observed4+ years COA history 5% underdosed17% low purity 509 107
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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03 Vendor name available with Pro Explore test results No buyer reviews indexed 543Unique reports 2026-10-12Last observed2+ years COA history 0% underdosed2% low purity 479 64
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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04 Vendor name available with Pro Explore test results 3 buyer reviews 386Unique reports 2026-10-09Last observed1+ year COA history 23% underdosed6% low purity1 endotoxin failure 324 62
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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05 Vendor name available with Pro Explore test results No buyer reviews indexed 354Unique reports 2026-09-18Last observed2+ years COA history 3% underdosed8% low purity 280 74
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
06 Vendor name available with Pro Explore test results No buyer reviews indexed 352Unique reports 2026-10-12Last observed1+ year COA history 0% underdosed1% low purity3 endotoxin failures 288 64
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
07 Vendor name available with Pro Explore test results No buyer reviews indexed 348Unique reports 2026-10-12Last observed1+ year COA history 0% underdosed6% low purity 282 66
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
08 Vendor name available with Pro Explore test results 2 buyer reviews 306Unique reports 2026-10-12Last observed1+ year COA history 0% underdosed8% low purity 278 28
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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09 Vendor name available with Pro Explore test results No buyer reviews indexed 266Unique reports 2026-10-01Last observed2+ years COA history 0% underdosed2% low purity 207 59
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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10 Vendor name available with Pro Explore test results 34 buyer reviews 264Unique reports 2026-09-18Last observed2+ years COA history 2% underdosed<1% low purity5 endotoxin failures 223 41
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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11 Vendor name available with Pro Explore test results 557 buyer reviews 210Unique reports 2026-10-09Last observed1+ year COA history 0% underdosed3% low purity7 endotoxin failures 159 51
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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12 Vendor name available with Pro Explore test results 77 buyer reviews 209Unique reports 2026-10-14Last observed1+ year COA history 2% underdosed6% low purity 179 30
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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13 Vendor name available with Pro Explore test results No buyer reviews indexed 205Unique reports 2026-10-14Last observed1+ year COA history 0% underdosed7% low purity 112 93
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
14 Vendor name available with Pro Explore test results 429 buyer reviews 201Unique reports 2026-10-14Last observed1+ year COA history 0% underdosed4% low purity 121 80
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
15 Vendor name available with Pro Explore test results 331 buyer reviews 193Unique reports 2026-08-06Last observed6+ years COA history 0% underdosed2% low purity 169 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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
16 Vendor name available with Pro Explore test results No buyer reviews indexed 183Unique reports 2026-10-08Last observed1+ year COA history 3% low purity 154 29
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
17 Vendor name available with Pro Explore test results 627 buyer reviews 172Unique reports 2026-09-24Last observed2+ years COA history 4% underdosed3% low purity1 endotoxin failure 151 21
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
18 Vendor name available with Pro Explore test results 742 buyer reviews 157Unique reports 2026-10-12Last observed2+ years COA history 4% underdosed4% low purity 123 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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
19 Vendor name available with Pro Explore test results No buyer reviews indexed 147Unique reports 2026-09-04Last observed1+ year COA history 3% low purity1 endotoxin failure 139 8
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
20 Vendor name available with Pro Explore test results No buyer reviews indexed 146Unique reports 2026-10-09Last observed1+ year COA history 6% low purity 115 31
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.
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
21 Cocer Peptides Explore test results 126 buyer reviews 132Unique reports 2026-09-30Last observed1+ year COA history 0% underdosed0% low purity 88 44
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.
Check the original reports, dates and tested batches.
22 BBA Peptides Explore test results 1 buyer review 127Unique reports 2026-08-21Last observed1+ year COA history 16% underdosed3% low purity 99 28
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.
Check the original reports, dates and tested batches.
23 HYB — Hangzhou Youngpeptide Biotechnology Hyb Explore test results 10 buyer reviews 118Unique reports 2026-09-30Last observed2+ years COA history 3% underdosed9% low purity 49 69
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.
Check the original reports, dates and tested batches.
24 PPHK — Peptide Pole HongKong Explore test results 215 buyer reviews 109Unique reports 2026-09-14Last observed< 1 year COA history 0% underdosed1% low purity2 endotoxin failures 83 26
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.
Check the original reports, dates and tested batches.
25 MKM — MKM Peptides Explore test results No buyer reviews indexed 109Unique reports 2026-10-14Last observed1+ year COA history 5% underdosed8% low purity 74 35
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.
Check the original reports, dates and tested batches.
26 Shanghai Baoju Explore test results No buyer reviews indexed 104Unique reports 2026-09-24Last observed1+ year COA history 3% low purity 85 19
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.
Check the original reports, dates and tested batches.
27 MandyBio Explore test results No buyer reviews indexed 103Unique reports 2026-08-05Last observed1+ year COA history 2% underdosed8% low purity1 endotoxin failure 97 6
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.
Check the original reports, dates and tested batches.
28 WBS — Shanghai Wibson Biotechnology Wbs Explore test results 131 buyer reviews 101Unique reports 2026-09-25Last observed1+ year COA history 0% underdosed4% low purity 57 44
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.
Check the original reports, dates and tested batches.
29 QH — Qihang Peptide Explore test results No buyer reviews indexed 38Unique reports 2026-09-16Last observed< 1 year COA history 3% underdosed0% low purity 5 33
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.
Check the original reports, dates and tested batches.
30 Forever Young Pharmacy Explore test results No buyer reviews indexed 27Unique reports 2026-03-03Last observed1+ year COA history 8% low purity 26 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.
Check the original reports, dates and tested batches.
Each report counts once, even when it tests several compounds or appears in multiple archives. Percentages need at least five applicable amount or purity results; explicit endotoxin failures are always shown. International classification does not establish factory ownership. See the methodology and known limitations.
Explore low purity, underfilled samples and other lab findings for this seller group →