Vendor vetting, explained

9 Peptide Vendor Red Flags to Check Before You Order (Canada, 2026)

The red flags that separate a vendor with real, checkable evidence from one selling on marketing alone — captive labs, vague answers, payment structure, and more.

Updated 2026-08-24

Janoshik vs. In-House Testing: Why Independent Verification Matters

Independent third-party testing and a vendor's own in-house numbers are not the same category of evidence. What the difference means when vetting a peptide vendor.

Updated 2026-08-24

How to Compare Canadian Peptide Vendors: A Practical Checklist

Comparing Canadian peptide vendors comes down to a small number of things you can actually verify — independent testing, shipping origin, payment options, and track record — not the marketing on the homepage.

Updated 2026-08-24

Growth Guys vs. Great Northern Peptides: How They Score on the Index

A side-by-side look at how Growth Guys and Great Northern Peptides compare on the published methodology — where each is strong, where each is unconfirmed, and why.

Updated 2026-08-24

COA Purity vs. Identity: What's the Difference? (And Why It Matters)

A Certificate of Analysis reports two separate results people constantly conflate — identity and purity. What each one actually proves, and why a high purity number alone can mislead.

Updated 2026-08-24