The Independent Rating System
Compare Research Vendors With Confidence
Vendors don't pay for placement here.The Score is the Score.
PeptideScores is the independent rating system for research peptide suppliers. We score every major vendor on the same six categories—purity & testing, service, shipping, selection, value, and reputation—using third-party Certificates of Analysis and verified data, not vendor marketing claims. We don’t sell peptides. Vendors can’t pay for placement or higher scores. We publish a number, show our work, and update it when the data changes.
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Active Sales
6 liveSouthern Aminos99.6
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Flawless Compounds99.5
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Glow Aminos99.5
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Elite Vendor·Industry Best Testing
Best for lab-verified purity
99.6
SCORE
United States
High Purity
Verified Labs
Endotoxin Tested
Elite
+3
Testing Summary
The most comprehensive testing in the industry! Freedom Diagnostics (HPLC-UV + LCMS/MS: Purity, Identity, Net Peptide Content) + ILS Labs (ISO/IEC 17025) Full QC Panel (HPLC, ICP-MS, PCR Sterility, Endotoxin, Heavy Metals, Conformity, Fentanyl and PH).
Purity & Testing
100.0
Reputation
99.5
Service
100.0
Shipping
100.0
Value
97.0
Selection
99.0
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Elite Vendor
Best value for budget buyers
99.5
SCORE
United States
High Purity
Fast Shipping
Community Fav
Endotoxin Tested
+2
Testing Summary
ILS Labs (ISO/IEC 17025) Full QC Panel: HPLC Purity (99.81–99.86%), Identity, PCR Sterility, Endotoxin (USP <85>), Heavy Metals (ICP-MS), Net Peptide Content, 3-Sample Conformity, Fentanyl Screen.
Purity & Testing
99.5
Reputation
99.0
Service
100.0
Shipping
100.0
Value
99.5
Selection
99.0
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GLOW AMINOS IS DONATING 5% OF PROFITS FROM OCTOBER’S SALE TO BREAST CANCER RESEARCH!
Get 40% off sitewide, plus an additional 15% off with code PEPSCORES—and save another 5% when you pay with Zelle.
Elite Vendor
Best for fast domestic shipping
99.5
SCORE
United States
High Purity
Verified Labs
Fast Shipping
Rising Star
+4
Testing Summary
ILS Labs (ISO/IEC 17025) Full QC Panel: HPLC Purity (99.29–99.96%), Identity, PCR Sterility, Endotoxin (USP <85>), Heavy Metals (ICP-MS), Net Peptide Content, Conformity, Fentanyl Screen.
Purity & Testing
99.5
Reputation
99.0
Service
100.0
Shipping
100.0
Value
99.5
Selection
99.0
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Anniversary Sale throughout October. Sale varies week to week. See sales flyer for details.
Elite Vendor
Best for hard to find peptides
99.1
SCORE
United States
Top Quality
High Purity
Verified Labs
Fast Shipping
Testing Summary
ILS Labs (ISO/IEC 17025) Full QC Panel: HPLC Purity, Identity, PCR Sterility, Endotoxin (USP <85>), Heavy Metals (ICP-MS), Net Peptide Content, Conformity. Freedom Diagnostics HPLC-UV + LCMS/MS for select products.
Purity & Testing
99.0
Reputation
99.0
Service
100.0
Shipping
100.0
Value
96.5
Selection
100.0
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Elite Vendor
Best for endotoxin-tested budget quality
99.0
SCORE
United States
Top Rated
Verified Labs
High Purity
Best Value
+2
Testing Summary
ILS Laboratories: Seven Metric Full QC Panel With Triplicate HPLC Conformity Testing. Purity, Net Content, and Identity Reported Across Three Independent Samples Per Lot With Mean and Standard Deviation. Five Verified Lots at 99.25–100.00%.
Purity & Testing
99.5
Reputation
96.5
Service
100.0
Shipping
100.0
Value
99.5
Selection
99.0
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Only 34 of 79 evaluated peptide suppliers currently meet PeptideScores verification standards. 1506 COAs reviewed.
Rankings are determined solely by our independent scoring methodology and not paid placement.
Sale! Sitewide sale varies per compound. Save an additional 10% with code pepscores
Elite Vendor·Best Value.
Best for budget shipping speed
98.6
SCORE
United States
Transparent
Best Value
Fast Shipping
Domestic
+2
Testing Summary
QR-Linked COA on Every Vial — Freedom Diagnostics and ILS Labs. New Batches Carry an 8-Assay Panel: Purity, Identity, Conformity, Net Content, Sterility, Endotoxin, Heavy Metals, Fentanyl. 99%+ Purity.
Purity & Testing
98.0
Reputation
99.0
Service
99.0
Shipping
100.0
Value
99.0
Selection
95.5
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Elite Vendor
Best for crypto-paying new vendors
98.5
SCORE
Est. 2026United States
Verified Labs
High Purity
New Entry
Rising Star
Testing Summary
Every batch is HPLC-purified to ≥99% and identity-confirmed by mass spectrometry, shipping with a full Certificate of Analysis — with published chromatograms, MS results, and an open CoA library for any batch
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Limited-Time: 50% Off With PEPSCORES
Elite Vendor
Best for community-trusted purity
98.5
SCORE
United States
High Purity
Verified Labs
Top Rated
Community Fav
Testing Summary
Third-Party Tested for 99%+ Purity, Verified Potency, and Contaminant-Free Results — Every Batch, Multiple Stages
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Elite Vendor
Best for budget endotoxin-tested peptides
98.3
SCORE
United States
Verified Labs
High Purity
Domestic
Endotoxin Tested
+1
Testing Summary
ILS Labs & Kovera Labs (HPLC-UV, LC-MS): Purity 99%+, recent lot 99.98%, Identity, Endotoxin, Sterility, Heavy Metals, Per-Vial Conformity. Unique batch code traceable production to delivery, QR-linked COA on every vial.
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Elite Vendor
Best for high-trust premium peptides
98.1
SCORE
United States
High Purity
Verified Labs
Transparent
High Trust
+1
Testing Summary
Freedom Diagnostics (Franklin, TN): HPLC-UV Purity (99.48–99.94%), LC-MS Identity, Net Peptide Content. Every Certificate Carries a Search Code Resolving in the Lab's Public Accession Database. Full Chromatogram and Mass-Confirmation Spectrum Reproduced on Every Report.
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Elite Vendor
Best for budget-conscious first-time buyers
98.1
SCORE
United States
Verified Labs
High Purity
Domestic
Fast Shipping
Testing Summary
Triple-Lab Verified: Kovera Labs (RP-HPLC, LC-MS, Endotoxin, Sterility, Heavy Metals, Batch Conformity), Freedom Diagnostics (HPLC-UV + LCMS/MS), Chromate Labs (HPLC, Identity). Purity 99.98% (Kovera). Traceable by SKU & report #.
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Elite Vendor
Best for budget buyers wanting endotoxin testing
97.9
SCORE
United States
Verified Labs
High Purity
Domestic
Endotoxin Tested
Testing Summary
Freedom Diagnostics HPLC-UV + LCMS/MS: Purity, Identity, Net Peptide Content. COA's searchable by accession # at FreedomDiagnosticsTesting.com.
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Elite Vendor
Best for transparentcommunity-verified quality
97.8
SCORE
United States
High Trust
Community Fav
Top Quality
Verified Labs
+1
Testing Summary
Dual-Lab Verified: ILS Labs (ISO/IEC 17025) Full QC Panel (HPLC, ICP-MS, PCR Sterility, Endotoxin, Identity, Heavy Metals, Net Peptide Content, Conformity) + Freedom Diagnostics HPLC-UV/LCMS/MS.
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Elite Vendor
Best for consistent quality at mid-tier pricing
97.5
SCORE
United States
High Purity
Domestic
Top Quality
Testing Summary
ILS Labs (ISO/IEC 17025) Full QC Panel: HPLC Purity (99.89–99.98%), Identity (HPLC-RTM), PCR Sterility, Endotoxin (USP <85>), Heavy Metals (ICP-MS), Net Peptide Content, 2-Sample HPLC Conformity, Fentanyl Screen. LC-MS Mass Spectrum for select products. Freedom Diagnostics HPLC-UV + LCMS/MS on legacy batches.
Elite Vendor
Best for multi-lab budget testing
97.4
SCORE
United States
Budget King
Best Value
New Entry
Transparent
+3
Testing Summary
Over 150 lot-specific COAs from ILS Laboratories, Vanguard Laboratory, and Freedom Diagnostics. Peptide purity 98.21–99.97%; identity confirmed on every report; full-QC panels (metals, sterility, endotoxin, fentanyl) on multiple lots.
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