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.
212 6A Labs Explore test results Seller type not reviewed No buyer reviews indexed 65Unique reports 2026-10-17Latest test date< 1 year COA history 2% underdosed0% low purity 29 36
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209 Off Label Explore test results Seller type not reviewed No buyer reviews indexed 65Unique reports 2026-10-14Latest test date< 1 year COA history 0% underdosed0% low purity 53 12
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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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213 PeakForm Peptides Explore test results Seller type not reviewed No buyer reviews indexed 65Unique reports 2026-10-10Latest test date< 1 year COA history 4% underdosed0% low purity 28 37
Lab evidence
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211 XTP — Xi'an Taiye Chemical Co. Explore test results Seller type not reviewed 7 buyer reviews 65Unique reports 2026-09-20Latest test date1+ year COA history 4% underdosed28% low purity 39 26
Lab evidence
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210 Hebei Rimao Technology Explore test results Seller type not reviewed No buyer reviews indexed 65Unique reports 2026-07-21Latest test date1+ year COA history 3% low purity 52 13
Lab evidence
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215 Purified Peptide Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-10-18Latest test date< 1 year COA history 4% underdosed2% low purity 44 20
Lab evidence
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216 Freedom Research Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-10-13Latest test date< 1 year COA history 4% underdosed0% low purity 41 23
Lab evidence
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214 Zzq Peptides Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-10-06Latest test date1+ year COA history 0% underdosed3% low purity 51 13
Lab evidence
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217 Biotech Collective Corp. Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-09-26Latest test date< 1 year COA history 8% underdosed2% low purity 35 29
Lab evidence
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218 Hudson Research Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-09-24Latest test date< 1 year COA history 10% underdosed0% low purity 26 38
Lab evidence
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219 Lifelab Research Explore test results Seller type not reviewed No buyer reviews indexed 64Unique reports 2026-09-21Latest test date< 1 year COA history 2% underdosed0% low purity 1 63
Lab evidence
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65 Onyx Research Explore test results U.S. reseller No buyer reviews indexed 64Unique reports 2026-07-17Latest test date1+ year COA history 9% underdosed0% low purity 56 8
Lab evidence
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225 GMR Peptides Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-10-21Latest test date< 1 year COA history 4% underdosed0% low purity 13 50
Lab evidence
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224 ProLixa Labs Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-10-03Latest test date< 1 year COA history 2% underdosed0% low purity 27 36
Lab evidence
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222 AminosRx Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-10-02Latest test date1+ year COA history 0% underdosed2% low purity 51 12
Lab evidence
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223 Next Level Labs Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-08-14Latest test date< 1 year COA history 2% underdosed0% low purity 33 30
Lab evidence
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220 Prime Sciences Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-07-31Latest test date1+ year COA history 3% underdosed0% low purity 61 2
Lab evidence
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221 Aminoswork Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2026-06-17Latest test date< 1 year COA history 2% underdosed2% low purity 59 4
Lab evidence
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226 onlythebestaas.com Explore test results Seller type not reviewed No buyer reviews indexed 63Unique reports 2023-12-08Latest test date5+ years COA history 12% underdosed12% low purity 0 63
Lab evidence
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229 Rocky Top Wellness Explore test results Seller type not reviewed No buyer reviews indexed 62Unique reports 2026-09-30Latest test date1+ year COA history 4% underdosed0% low purity 38 24
Lab evidence
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228 Lspl Explore test results Seller type not reviewed No buyer reviews indexed 62Unique reports 2026-09-08Latest test date1+ year COA history 0% underdosed3% low purity 46 16
Lab evidence
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227 Riptide Wellness Explore test results Seller type not reviewed No buyer reviews indexed 62Unique reports 2026-05-29Latest test date< 1 year COA history 9% underdosed6% low purity 62 0
Lab evidence
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234 Trusted Peptides Explore test results Seller type not reviewed No buyer reviews indexed 61Unique reports 2026-10-09Latest test date1+ year COA history 0% underdosed0% low purity 27 34
Lab evidence
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232 Bionetik Labs Explore test results Seller type not reviewed No buyer reviews indexed 61Unique reports 2026-10-08Latest test date1+ year COA history 2% underdosed0% low purity 41 20
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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233 Rejuven8 Peptides Explore test results Seller type not reviewed No buyer reviews indexed 61Unique reports 2026-09-21Latest test date4+ years COA history 0% underdosed2% low purity 36 25
Lab evidence
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230 Purity Peptides Explore test results Seller type not reviewed No buyer reviews indexed 61Unique reports 2026-09-03Latest test date1+ year COA history 0% underdosed0% low purity 58 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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231 Ultra Pure Bioscience Explore test results Seller type not reviewed No buyer reviews indexed 61Unique reports 2026-07-21Latest test date1+ year COA history 4% underdosed0% low purity 55 6
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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236 Step One Ventures LLC Explore test results Seller type not reviewed No buyer reviews indexed 60Unique reports 2026-10-13Latest test date1+ year COA history 5% underdosed0% low purity 10 50
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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235 RegenVV Explore test results Seller type not reviewed No buyer reviews indexed 60Unique reports 2026-10-03Latest test date< 1 year COA history 2% underdosed0% low purity 16 44
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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66 Premier Bio Labs Explore test results U.S. reseller No buyer reviews indexed 60Unique reports 2026-07-02Latest test date< 1 year COA history 10% underdosed5% low purity 47 13
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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237 AMP Explore test results Seller type not reviewed No buyer reviews indexed 60Unique reports 2026-04-17Latest test date1+ year COA history 2% underdosed0% low purity 6 54
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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240 Kenson Health Optimization Explore test results Seller type not reviewed No buyer reviews indexed 59Unique reports 2026-10-21Latest test date< 1 year COA history 0% underdosed0% low purity 24 35
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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239 Cupoftea LLC Explore test results Seller type not reviewed No buyer reviews indexed 59Unique reports 2026-10-19Latest test date1+ year COA history 6% underdosed2% low purity 33 26
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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67 Amino Science Explore test results U.S. reseller No buyer reviews indexed 59Unique reports 2026-10-14Latest test date< 1 year COA history 15% underdosed0% low purity 32 27
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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242 OxygenPharm Explore test results Seller type not reviewed No buyer reviews indexed 59Unique reports 2026-05-27Latest test date4+ years COA history 4% underdosed62% low purity 16 43
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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238 PNH/Life Lab Research Explore test results Seller type not reviewed No buyer reviews indexed 59Unique reports 2026-05-02Latest test date< 1 year COA history 0% underdosed7% low purity 59 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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241 Growth Guys Canada Explore test results Seller type not reviewed No buyer reviews indexed 59Unique reports 2026-04-16Latest test date3+ years COA history 25% low purity 21 38
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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245 ASTERA LABS Explore test results Seller type not reviewed No buyer reviews indexed 58Unique reports 2026-04-24Latest test date2+ years COA history 0% underdosed 11 47
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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243 Zhejiang Yichenkang Biotechnology Explore test results Seller type not reviewed No buyer reviews indexed 58Unique reports 2025-12-11Latest test date1+ year COA history 2% low purity 58 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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244 Mob Peptides Explore test results Seller type not reviewed No buyer reviews indexed 58Unique reports 2025-09-05Latest test date2+ years COA history 0% underdosed0% low purity 31 27
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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246 HEIR Peptides, LLC Explore test results Seller type not reviewed No buyer reviews indexed 57Unique reports 2026-09-06Latest test date< 1 year COA history 4% underdosed0% low purity 22 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.
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247 Aligned Aminos Explore test results Seller type not reviewed No buyer reviews indexed 56Unique reports 2026-10-15Latest test date< 1 year COA history 6% underdosed0% low purity 34 22
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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248 Nova Aminos Explore test results Seller type not reviewed No buyer reviews indexed 56Unique reports 2026-08-28Latest test date< 1 year COA history 0% underdosed0% low purity 33 23
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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68 Crownwell Research Explore test results U.S. reseller No buyer reviews indexed 55Unique reports 2026-10-20Latest test date< 1 year COA history 2% underdosed0% low purity 37 18
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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255 Island Peptide Explore test results Seller type not reviewed No buyer reviews indexed 55Unique reports 2026-10-20Latest test date< 1 year COA history 5% underdosed0% low purity 10 45
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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251 YouRetty Explore test results Seller type not reviewed No buyer reviews indexed 55Unique reports 2026-10-10Latest test date< 1 year COA history 14% underdosed2% low purity 37 18
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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253 VeloPep Labs, LLC Explore test results Seller type not reviewed No buyer reviews indexed 55Unique reports 2026-09-29Latest test date1+ year COA history 2% underdosed0% low purity 26 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.
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252 ANKR Explore test results Seller type not reviewed No buyer reviews indexed 55Unique reports 2026-09-21Latest test date< 1 year COA history 7% underdosed0% low purity 29 26
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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254 FSD Explore test results Seller type not reviewed 256 buyer reviews 55Unique reports 2026-07-13Latest test date1+ year COA history 5% underdosed0% low purity 17 38
Lab evidence
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249 PTA Explore test results Seller type not reviewed No buyer reviews indexed 55Unique reports 2026-07-02Latest test date< 1 year COA history 40% underdosed0% low purity 55 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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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 · 57,121 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.