The Journal
How to tell a real supplier from a good website
Verification, handling, and evidence — written for researchers who read the certificate before they read the price.
Verification · 7 min read
HPLC and Mass Spectrometry Answer Different Questions
Two techniques appear on almost every peptide certificate, and they are routinely treated as interchangeable evidence of quality. They are not. One measures proportion; the other measures mass.
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Verification · 6 min
Purity and Identity Are Not the Same Claim
The most common misreading of a peptide certificate is treating a purity percentage as an answer to 'is this the right compound.' It is not, and the distinction is not pedantic.
Verification · 7 min
What a Certificate of Analysis Actually Proves — and What It Doesn't
Nearly every supplier says 'COA available.' Far fewer will show you one before you buy, and fewer still ship a certificate that matches the vial in the box. Here is how to tell the difference.
Buying · 5 min
Why Two Suppliers Sell 'TB-500' at Molecular Weights Five Times Apart
One name, two molecules, a fivefold difference in mass, and two separate bodies of literature. This is the clearest example of why you check the molecular weight before you check the price.
Handling · 6 min
Cold Chain: What Actually Degrades a Peptide in Transit
Cold chain packaging is worth paying for, but not for the reason most suppliers imply. Lyophilized material is stable. The real risks start after the box is opened.
Evidence · 6 min
When All the Research Comes From One Lab
BPC-157 has hundreds of publications and one dominant author group. Epitalon has a similar profile. Neither fact makes the findings wrong — but both change how much weight they carry.
Mechanism · 11 min
A Map of Peptide Mechanisms: What Acts Where
Most peptide catalogues are organised by what people hope a compound does. This one is organised by what it binds. Here is the whole landscape in one place.
Mechanism · 9 min
Incretin Receptors: Why Single, Dual, and Triple Agonists Differ
Four compounds, four different receptor profiles, and one genuinely unresolved controversy about whether GIP receptor agonism and antagonism do the same thing.
Mechanism · 8 min
The Growth Hormone Axis: Two Receptors, Frequently Confused
Five compounds, three receptors, and one distinction that determines whether two products are alternatives or complements.
Mechanism · 9 min
Tissue Repair: Three Unrelated Mechanisms Under One Heading
Four compounds filed under 'repair' that share almost nothing mechanistically. Understanding the difference is what lets you choose between them.