certificate of analysis

Do Peptide Vendors Publish Their Lab Results? A Study of 76 Storefronts

Best Peptide Companies: How to Choose a Peptide Supplier in the USA

Most lists of the best peptide companies rank vendors and show no evidence. This is the scorecard instead: ten checks you can run on any supplier before paying, with what we measured across 46 US storefronts and 16 US laboratories.

Peptide Testing in Canada: HPLC, Mass Spec and Reading a COA

Every vendor says its material is pure, and almost nobody who reads the claim can evaluate it. What reversed-phase HPLC and mass spectrometry each actually measure, the seven fields a Certificate of Analysis has to carry, the four things it cannot establish, and the one verification step that does not depend on trusting the seller.

What a Peptide Blend Costs You Analytically

Put four peptides in one vial and ask what its purity figure refers to. The largest peak is not the product, and the other three peaks are not impurities. What a blend costs you analytically, with our own four blends audited against the same standard.

Identity Is the Test Almost Nobody Runs

Rearrange TB-500's seven residues and there are 1,260 arrangements that all weigh exactly the same. Purity gets reported constantly and identity almost never, so here is what each method can and cannot establish about whether a vial holds the sequence on the label.

BPC-157 and TB-500 Blends with KPV, Cartalax or GHK-Cu: Composition and Verification

At least three different vials combine BPC-157 and TB-500 with a third or fourth peptide: KPV, Cartalax, or KPV plus GHK-Cu. What each version actually contains, why a large share of Cartalax listings print Bronchogen's sequence instead, what is characterised about each component at the molecular level, and why a purity figure on a four-peptide certificate has stopped meaning what it means on a single-peptide one.

How to Verify a Peptide in Canada

A vial is the end of a chain that runs from a synthesis lot to the note you write when the parcel arrives. Where each link sits, what proves it, how each one breaks in this market, and why a purity percentage cannot answer the quantity question.

How to Tell If a Peptide Supplier Is Legitimate: The 2027 Verification Checklist

A certificate of analysis is the easiest document in this market to fake. Nine checks, ranked by how hard each one is to fake, including the two that separate a traceable supplier from a convincing one.

10 Best Canadian Peptide Vendors in 2027

Eight Canadian peptide suppliers scored on six published criteria, with every vendor score, the 0 to 5 anchors, the evidence behind each one and the weighted arithmetic shown. Two of the ten originally reviewed have closed and are listed with the evidence. Reviewed October 21, 2026.

10 Best USA Peptide Providers in 2027

US research suppliers, reference-standard houses, licensed medical services and GMP manufacturers are four different markets, so this comparison ranks them separately on six weighted criteria led by analytical documentation. Every vendor claim was checked against its live site in October 2026.

Where to Buy Peptides in Canada Online: The Ultimate Guide (2027 Edition)

A checkable procedure for evaluating any Canadian peptide supplier: the legal position under Health Canada, what actually happens to a cross-border parcel, how to read a Certificate of Analysis line by line, and the red flags that separate a real supplier from a dropshipper.

GHK-Cu, KPV, TB-500 and BPC-157 Blend 80mg: Measured Composition and Certificate Data

An 80mg four-component blend with a published certificate: GHK-Cu, KPV, TB-500 and BPC-157, each measured separately. What the certificate reports, how the headline purity is calculated, and what is genuinely not known about the combination.

How to Read a Certificate of Analysis (COA): The Complete Guide for Peptide Researchers

A working guide to interpreting every section of a peptide Certificate of Analysis, from HPLC chromatograms and mass spec data to spotting the red flags that separate credible documentation from recycled paperwork.