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Vendors with the most tested samples showing at least one problem.
Investigate 3,071 peptide vendors.
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51 AMO — Bfflist Amo Explore test results Seller type not reviewed 6 buyer reviews 146Unique reports 2026-10-06Latest test date1+ year COA history 3% underdosed0% low purity4 endotoxin failures 83 63
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52 True Peptide Labs Explore test results Seller type not reviewed No buyer reviews indexed 145Unique reports 2026-10-16Latest test date1+ year COA history 9% underdosed2% low purity 103 42
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53 Grey Market Peptides Explore test results Seller type not reviewed No buyer reviews indexed 143Unique reports 2026-03-13Latest test date< 1 year COA history 12% underdosed1% low purity 143 0
Lab evidence
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54 AMC Essentials Explore test results Seller type not reviewed No buyer reviews indexed 140Unique reports 2026-08-15Latest test date1+ year COA history 9% underdosed2% low purity 136 4
Lab evidence
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55 Como Peptides Explore test results Seller type not reviewed No buyer reviews indexed 139Unique reports 2026-10-18Latest test date< 1 year COA history 6% underdosed1% low purity 66 73
Lab evidence
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56 Affordable Peptides Explore test results Seller type not reviewed No buyer reviews indexed 137Unique reports 2026-10-20Latest test date< 1 year COA history 5% underdosed0% low purity 65 72
Lab evidence
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58 Zenith Biopeptides Explore test results Seller type not reviewed No buyer reviews indexed 134Unique reports 2026-10-19Latest test date1+ year COA history 1% underdosed2% low purity 100 34
Lab evidence
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59 Nova Peptides Explore test results Seller type not reviewed No buyer reviews indexed 134Unique reports 2026-10-10Latest test date< 1 year COA history 4% underdosed2% low purity 86 48
Lab evidence
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57 APS — Andy Peps Studio Explore test results Seller type not reviewed 13 buyer reviews 134Unique reports 2026-10-06Latest test date1+ year COA history 4% underdosed0% low purity 108 26
Lab evidence
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60 Kalyx labs LLC Explore test results Seller type not reviewed No buyer reviews indexed 133Unique reports 2026-10-17Latest test date< 1 year COA history 1% underdosed0% low purity 69 64
Lab evidence
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61 Yimei Explore test results Seller type not reviewed No buyer reviews indexed 132Unique reports 2026-10-20Latest test date1+ year COA history 5% low purity 109 23
Lab evidence
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62 Jade Nexus Explore test results Seller type not reviewed No buyer reviews indexed 130Unique reports 2026-10-21Latest test date1+ year COA history 9% underdosed3% low purity 88 42
Lab evidence
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64 Lumira Explore test results Seller type not reviewed No buyer reviews indexed 128Unique reports 2026-10-20Latest test date< 1 year COA history 12% underdosed6% low purity1 endotoxin failure 48 80
Lab evidence
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63 Nutrastrips Explore test results Seller type not reviewed No buyer reviews indexed 128Unique reports 2026-10-16Latest test date1+ year COA history 2% low purity 81 47
Lab evidence
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66 TrueLab Peptides Explore test results Seller type not reviewed No buyer reviews indexed 123Unique reports 2026-10-16Latest test date< 1 year COA history 1% underdosed0% low purity 75 48
Lab evidence
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65 Mai Peptide Explore test results Seller type not reviewed No buyer reviews indexed 123Unique reports 2026-10-06Latest test date1+ year COA history 7% low purity 76 47
Lab evidence
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67 EZP Explore test results Seller type not reviewed No buyer reviews indexed 122Unique reports 2026-03-27Latest test date1+ year COA history 1% underdosed0% low purity 3 119
Lab evidence
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69 Aminos Research Explore test results Seller type not reviewed No buyer reviews indexed 117Unique reports 2026-04-28Latest test date3+ years COA history 1% low purity 7 110
Lab evidence
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68 P4R Wholesale, LLC Explore test results Seller type not reviewed No buyer reviews indexed 117Unique reports 2026-03-12Latest test date1+ year COA history 11% underdosed5% low purity 116 1
Lab evidence
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70 Good Looks Plus Shenanigans Explore test results Seller type not reviewed No buyer reviews indexed 116Unique reports 2026-10-14Latest test date< 1 year COA history 7% underdosed2% low purity 65 51
Lab evidence
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71 Happy Peps Explore test results Seller type not reviewed No buyer reviews indexed 116Unique reports 2026-10-08Latest test date1+ year COA history 2% underdosed1% low purity 60 56
Lab evidence
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72 Prime Longevity Peptides Explore test results Seller type not reviewed No buyer reviews indexed 114Unique reports 2026-09-26Latest test date< 1 year COA history 6% underdosed2% low purity 80 34
Lab evidence
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76 Ramp Peptides Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-10-15Latest test date< 1 year COA history 3% underdosed0% low purity 37 70
Lab evidence
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75 Zepeptide Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-10-14Latest test date< 1 year COA history 4% low purity1 endotoxin failure 52 55
Lab evidence
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74 Ozarks Research Cache LLC Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-09-18Latest test date< 1 year COA history 2% underdosed0% low purity 53 54
Lab evidence
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73 DSP Explore test results Seller type not reviewed No buyer reviews indexed 107Unique reports 2026-06-29Latest test date1+ year COA history 29% underdosed1% low purity 107 0
Lab evidence
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80 LP Peptide Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-10-20Latest test date< 1 year COA history 6% underdosed3% low purity 4 101
Lab evidence
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79 MIX — Mix Peptides Explore test results Seller type not reviewed 5 buyer reviews 105Unique reports 2026-10-08Latest test date1+ year COA history 0% underdosed5% low purity 80 25
Lab evidence
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78 SP Biolabs Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-08-30Latest test date< 1 year COA history 8% underdosed0% low purity 83 22
Lab evidence
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77 Jett Labs Explore test results Seller type not reviewed No buyer reviews indexed 105Unique reports 2026-08-26Latest test date1+ year COA history 4% underdosed1% low purity 85 20
Lab evidence
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81 RL Bioresearch LLC Explore test results Seller type not reviewed No buyer reviews indexed 104Unique reports 2026-10-16Latest test date< 1 year COA history 3% underdosed0% low purity 70 34
Lab evidence
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82 Molecular Solutions Peptides Explore test results Seller type not reviewed No buyer reviews indexed 103Unique reports 2026-10-08Latest test date1+ year COA history 4% underdosed0% low purity 66 37
Lab evidence
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85 PeptideRUO LLC Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-10-15Latest test date1+ year COA history 4% underdosed1% low purity 43 59
Lab evidence
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84 Underground Pharm Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-09-29Latest test date1+ year COA history 4% underdosed0% low purity 66 36
Lab evidence
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83 aura Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-07-21Latest test date1+ year COA history 3% underdosed3% low purity 98 4
Lab evidence
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86 Unique Pharmaceutical Explore test results Seller type not reviewed No buyer reviews indexed 102Unique reports 2026-07-16Latest test date4+ years COA history 13% underdosed 35 67
Lab evidence
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88 Novapeptide Explore test results Seller type not reviewed No buyer reviews indexed 101Unique reports 2026-10-20Latest test date< 1 year COA history 5% underdosed2% low purity 7 94
Lab evidence
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87 Formera Research Explore test results Seller type not reviewed No buyer reviews indexed 101Unique reports 2026-09-10Latest test date< 1 year COA history 5% underdosed3% low purity 84 17
Lab evidence
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92 Authentichain Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-10-16Latest test date< 1 year COA history 12% underdosed0% low purity 29 71
Lab evidence
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89 BioVitalis Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-10-08Latest test date< 1 year COA history 7% underdosed0% low purity 63 37
Lab evidence
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90 JTP — Just The Product Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-09-29Latest test date1+ year COA history 0% underdosed0% low purity 62 38
Lab evidence
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91 Bio Health Peptides Proteins Explore test results Seller type not reviewed No buyer reviews indexed 100Unique reports 2026-09-29Latest test date< 1 year COA history 1% underdosed0% low purity 49 51
Lab evidence
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94 Stemalia Explore test results Seller type not reviewed No buyer reviews indexed 99Unique reports 2026-10-10Latest test date< 1 year COA history 4% underdosed0% low purity 62 37
Lab evidence
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93 US Peptide Co Explore test results Seller type not reviewed No buyer reviews indexed 99Unique reports 2026-06-27Latest test date1+ year COA history 8% underdosed0% low purity 99 0
Lab evidence
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96 Ascend Amino Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-20Latest test date4+ years COA history 4% underdosed0% low purity 69 29
Lab evidence
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99 Umbrella Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-14Latest test date2+ years COA history 15% underdosed0% low purity 15 83
Lab evidence
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98 Henan Sahe Peptide Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-10-09Latest test date1+ year COA history 5% low purity 45 53
Lab evidence
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97 Amino USA Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-09-10Latest test date1+ year COA history 5% underdosed2% low purity 66 32
Lab evidence
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95 Modern Research Peptides Explore test results Seller type not reviewed No buyer reviews indexed 98Unique reports 2026-05-04Latest test date1+ year COA history 2% underdosed0% low purity 97 1
Lab evidence
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100 Dankang Biohealth Explore test results Seller type not reviewed No buyer reviews indexed 97Unique reports 2026-10-20Latest test date< 1 year COA history 4% low purity 69 28
Lab evidence
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Pick a compound, then a report, to see what the lab measured. Each report counts once, and only reports with a source link and a readable result appear here, so this list can hold fewer reports than the total above.
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More reports means more evidence to inspect, not better quality. Each report counts once. Purity and amount percentages require at least five applicable results; explicit endotoxin failures are always shown. Missing measurements are not passes.
Understand the coverage
- Published COA report entries
- 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.