How We Rank
Our scoring methodology for research peptide brands — transparent, consistent, and applied the same way to every brand.
Our rankings are built on a consistent, repeatable scoring system. We evaluate each research-peptide supplier against five criteria, drawing on publicly available lab reports, certificates of analysis, pricing, shipping policies, and customer feedback. Here's exactly how we do it.
What We Score
Third-Party Lab Testing
Every brand is scored on whether it publishes independent HPLC/MS purity reports for each batch — non-negotiable for research use.
Verified Purity
We weight suppliers that consistently certify ≥99% purity and make their certificates of analysis publicly accessible.
Shipping & Cold Chain
Reconstitution-sensitive compounds need fast, properly packed shipping. We track delivery speed and packaging quality.
Pricing & Value
Cost per mg, bulk discounts, and loyalty pricing — measured against the purity you actually receive.
Our Process
- 1
Shortlist suppliers
We compile suppliers that openly sell research peptides to qualified buyers and have a verifiable web presence, then filter out those with no documentation or a poor reputation.
- 2
Examine purity & testing
We look for independent, batch-specific Certificates of Analysis — HPLC for purity, mass spectrometry for identity. Suppliers that publish COAs and certify high purity score highest.
- 3
Assess pricing & value
We compare cost per mg, bulk and wholesale discounts, and promotions against the documented quality on offer.
- 4
Evaluate shipping & service
We review shipping speed, packaging, regions served, and the responsiveness of customer support.
- 5
Weigh reputation
We factor in customer feedback and each supplier's track record before assigning a final score and rank.
Editorial Independence
Third-party testing and verified purity carry the most weight, followed by value, shipping and service, and reputation. Scores are relative across the suppliers we review and are revisited as the market changes. No supplier can pay to alter its score.
Sources We Consult
- 1.PubMed — peptide research literature
- 2.U.S. FDA — Drugs information & guidance
- 3.Certificate of Analysis (COA) — overview
- 4.High-performance liquid chromatography (HPLC)
External links are provided for research reference only and do not constitute an endorsement or medical advice.
Marcus Reed
Lead Researcher & Editor
Marcus leads research and editorial at Top5 Peptides. He and the team evaluate every supplier against the same criteria — independent third-party testing, purity documentation, pricing, and shipping — so the rankings stay consistent and impartial.