The Independent Rating System
Research Peptide Vendor Rankings
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.
PeptideScores may earn affiliate commissions when you buy through links on this page. Commissions never influence scores, rankings, or placement.
New brand from the founders of Flawless and Glow! Same top tier testing.
Iron Protocol - Labor Day Launch Day Sale!! Save 45% sitewide + coupon PEPSCORES stacks for additional 15% off.
Ranked Vendors
Global leaders in research peptides
Smart Search—find vendors by peptide or compound
Flawless Compounds - Labor Day Sale! Save 35% on purchases up to $290. 45% on purchases $300-399 and 50% on purchases $400 and over.
Elite Vendor
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 - Labor Day Sale! Save 35% on purchases up to $290. 45% on purchases $300-399 and 50% on purchases $400 and over.
Elite Vendor
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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Elite Vendor·Industry Best Testing
99.4
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
95.5
Selection
99.0
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New brand from the founders of Flawless and Glow! Same top tier testing.
Iron Protocol - Labor Day Launch Day Sale!! Save 45% sitewide + coupon PEPSCORES stacks for additional 15% off.
Elite Vendor
99.2
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
97.5
Service
100.0
Shipping
100.0
Value
99.5
Selection
99.0
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Elite Vendor
98.8
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
99.0
Value
95.0
Selection
100.0
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Only 32 of 69 evaluated peptide suppliers currently meet PeptideScores verification standards. 339 COAs reviewed.
Rankings are determined solely by our independent scoring methodology and not paid placement.
Elite Vendor
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
Purity & Testing
100.0
Reputation
99.0
Service
99.0
Shipping
98.0
Value
95.5
Selection
95.5
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Coupon code PEPSCORES is temporarily increased to 30% off sitewide, plus an additional 10% if you pay with crypto.
Elite Vendor
98.3
SCORE
United States
High Purity
Verified Labs
Fast Shipping
Testing Summary
Every batch is third-party tested by Janoshik, the independent lab researchers trust, confirming identity, purity, and composition — with COAs available for every product.
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Buy 3, Get 1 Free on GLP Category Compounds
Elite Vendor·Best Value.
98.1
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.
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Elite Vendor
98.0
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
98.0
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
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
97.8
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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Elite Vendor
97.8
SCORE
United States
High Trust
Community Fav
Top Quality
Verified Labs
+2
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
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
97.0
SCORE
United States
High Purity
Transparent
Fast Shipping
Domestic
+1
Testing Summary
ILS Laboratories (ISO/IEC 17025) Full QC Panel: HPLC Purity (>99%), Identity, Quantity, PCR Sterility, Endotoxins (LAL), Heavy Metals (ICP-MS, USP <233>), Fentanyl Screen. QR Code and Access Code Verification Resolving at the Lab's Own Portal.
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