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.
01 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 318Unique reports 2026-10-02Latest test date1+ year COA history 4% underdosed<1% low purity 265 53
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
See who these vendors are.Sign up with your email to see every vendor name in this directory. No payment needed. Pro adds original COAs, batch details and buyer reviews.Sign up to see names
Already have an account? Sign in
02 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 312Unique reports 2026-09-28Latest test date1+ year COA history 3% underdosed1% low purity 207 105
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
03 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 311Unique reports 2026-10-14Latest test date1+ year COA history 5% underdosed2% low purity 223 88
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
04 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 304Unique reports 2026-10-16Latest test date1+ year COA history 7% underdosed0% low purity 249 55
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
05 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 302Unique reports 2026-10-18Latest test date1+ year COA history 3% underdosed<1% low purity 181 121
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
06 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 293Unique reports 2026-10-20Latest test date2+ years COA history 8% underdosed3% low purity2 endotoxin failures 213 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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
07 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 285Unique reports 2026-10-19Latest test date< 1 year COA history 3% underdosed1% low purity 129 156
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
08 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 281Unique reports 2026-10-12Latest test date1+ year COA history 0% underdosed2% low purity1 endotoxin failure 240 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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
09 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 281Unique reports 2026-10-03Latest test date2+ years COA history 3% underdosed1% low purity 193 88
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
10 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 264Unique reports 2026-10-20Latest test date2+ years COA history 0% underdosed19% low purity 249 15
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
11 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 257Unique reports 2026-10-21Latest test date1+ year COA history 1% underdosed0% low purity 150 107
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
12 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 255Unique reports 2026-09-03Latest test date< 1 year COA history 4% underdosed2% low purity 187 68
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
13 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 254Unique reports 2026-10-16Latest test date< 1 year COA history 3% underdosed2% low purity 155 99
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
14 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 253Unique reports 2025-09-10Latest test date2+ years COA history 3% underdosed8% low purity 135 118
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
15 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 244Unique reports 2026-02-24Latest test date6+ years COA history 5% underdosed33% low purity 16 228
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
16 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 233Unique reports 2026-10-16Latest test date1+ year COA history 3% underdosed1% low purity 199 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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
17 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 232Unique reports 2026-09-24Latest test date2+ years COA history 0% underdosed15% low purity 223 9
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
18 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 229Unique reports 2026-10-02Latest test date1+ year COA history 1% underdosed1% low purity 181 48
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
19 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 215Unique reports 2026-10-17Latest test date< 1 year COA history 1% underdosed0% low purity 15 200
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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
20 Vendor name available with Pro Explore test results Seller type not reviewed No buyer reviews indexed 208Unique reports 2026-06-28Latest test date< 1 year COA history 5% underdosed0% low purity 208 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.
Which vendor is this?
Sign up to see the name behind these reports. No payment needed. Pro adds the original lab reports and batch details.
Vendor behind these reportsVendor name available with Pro
Sign up to see names
Already have an account? Sign in
21 Oupeptide Explore test results Seller type not reviewed No buyer reviews indexed 204Unique reports 2026-09-15Latest test date1+ year COA history 0% underdosed4% low purity 179 25
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
22 Somachems Explore test results Seller type not reviewed No buyer reviews indexed 198Unique reports 2026-10-08Latest test date1+ year COA history 11% underdosed5% low purity 146 52
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
23 Hilma Biocare Explore test results Seller type not reviewed No buyer reviews indexed 188Unique reports 2026-06-22Latest test date8+ years COA history 9% underdosed31% low purity 72 116
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
24 Real Peptides Explore test results Seller type not reviewed No buyer reviews indexed 187Unique reports 2026-06-25Latest test date1+ year COA history 2% underdosed3% low purity 166 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
25 Amino Lair Explore test results Seller type not reviewed 9 buyer reviews 186Unique reports 2026-10-08Latest test date1+ year COA history 1% underdosed0% low purity 146 40
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
26 Peptide Crafters Explore test results Seller type not reviewed No buyer reviews indexed 182Unique reports 2026-10-12Latest test date2+ years COA history 0% underdosed5% low purity 90 92
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
27 PeptidePlugs.com Explore test results Seller type not reviewed No buyer reviews indexed 181Unique reports 2026-10-16Latest test date4+ years COA history 3% underdosed1% low purity 64 117
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
28 Hxnet Explore test results Seller type not reviewed No buyer reviews indexed 178Unique reports 2026-10-12Latest test date2+ years COA history 2% low purity1 endotoxin failure 159 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
29 Peptide Restore Explore test results Seller type not reviewed No buyer reviews indexed 175Unique reports 2026-10-16Latest test date< 1 year COA history 4% underdosed4% low purity 149 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
30 Star Nutrasciences Inc. Explore test results Seller type not reviewed No buyer reviews indexed 175Unique reports 2026-08-04Latest test date< 1 year COA history 6% underdosed0% low purity 138 37
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
31 Genesis Peptides Explore test results Seller type not reviewed No buyer reviews indexed 170Unique reports 2026-10-10Latest test date1+ year COA history 2% underdosed0% low purity 111 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
32 Synthesis Peptides LLC Explore test results Seller type not reviewed No buyer reviews indexed 165Unique reports 2026-10-10Latest test date1+ year COA history 1% underdosed2% low purity 119 46
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
33 Modern Research LLC Explore test results Seller type not reviewed No buyer reviews indexed 165Unique reports 2026-02-24Latest test date1+ year COA history 4% underdosed2% low purity 20 145
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
34 NELA Peptides Explore test results Seller type not reviewed No buyer reviews indexed 163Unique reports 2026-09-26Latest test date1+ year COA history 5% underdosed1% low purity 98 65
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
35 Xcel Peptides Explore test results Seller type not reviewed No buyer reviews indexed 162Unique reports 2026-03-11Latest test date3+ years COA history 6% underdosed0% low purity 3 159
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
36 Novaglo Research Explore test results Seller type not reviewed No buyer reviews indexed 161Unique reports 2026-10-15Latest test date< 1 year COA history 0% underdosed3% low purity 129 32
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
37 Zen Aminos Explore test results Seller type not reviewed No buyer reviews indexed 160Unique reports 2026-09-13Latest test date1+ year COA history 4% underdosed1% low purity 128 32
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
38 Short Chain Aminos Explore test results Seller type not reviewed No buyer reviews indexed 159Unique reports 2026-10-13Latest test date1+ year COA history 3% underdosed0% low purity 106 53
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
40 Pura Peptides Explore test results Seller type not reviewed 3 buyer reviews 157Unique reports 2026-10-02Latest test date1+ year COA history 1% underdosed3% low purity 114 43
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
39 Optima Chemical Supply, Inc. Explore test results Seller type not reviewed No buyer reviews indexed 157Unique reports 2026-07-08Latest test date4+ years COA history 0% underdosed0% low purity 146 11
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
41 Gulf Coast Amino Acids Explore test results Seller type not reviewed No buyer reviews indexed 156Unique reports 2026-10-17Latest test date1+ year COA history 1% underdosed1% low purity 114 42
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
42 Pius Solutions, Inc. Explore test results Seller type not reviewed No buyer reviews indexed 155Unique reports 2026-10-16Latest test date< 1 year COA history 1% underdosed6% low purity 83 72
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
43 Supernova Sciences Explore test results Seller type not reviewed No buyer reviews indexed 154Unique reports 2026-09-15Latest test date1+ year COA history 10% underdosed3% low purity 133 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
44 INTEX PHARMA Explore test results Seller type not reviewed No buyer reviews indexed 154Unique reports 2026-02-16Latest test date5+ years COA history 11% underdosed33% low purity 0 154
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
45 Coffee And Peppers Explore test results Seller type not reviewed No buyer reviews indexed 152Unique reports 2026-10-21Latest test date1+ year COA history 3% underdosed4% low purity 133 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
46 Treasure Coast Peptides Explore test results Seller type not reviewed No buyer reviews indexed 152Unique reports 2026-10-18Latest test date1+ year COA history 5% underdosed3% low purity 114 38
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
47 JT's Biocore LLC Explore test results Seller type not reviewed No buyer reviews indexed 152Unique reports 2026-10-08Latest test date< 1 year COA history 8% underdosed1% low purity 89 63
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
48 Peptide Pro Explore test results Seller type not reviewed No buyer reviews indexed 151Unique reports 2026-01-18Latest test date1+ year COA history 6% underdosed1% low purity 151 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
50 PeptideSupplyCo.com Explore test results Seller type not reviewed No buyer reviews indexed 150Unique reports 2026-10-16Latest test date< 1 year COA history 4% underdosed0% low purity 82 68
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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
49 Peptide Technologies Explore test results Seller type not reviewed No buyer reviews indexed 150Unique reports 2026-02-01Latest test date1+ year COA history 1% underdosed2% low purity 150 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.
Read the evidence behind the summary.
Open vendor profile
Check the original reports, dates and tested batches.
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
- 120,981
- 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 · 17,266 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 · 57,122 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.