Blog
US research peptides blog
Oct 27, 2026
Peptide Endotoxin and Sterility Testing Explained
Endotoxin and sterility tests answer two separate questions about a research peptide batch. Here is how LAL, recombinant Factor C and USP <71> work, and how to read them on a COA.
Sep 17, 2026
What Is Cold-Chain Shipping for Research Peptides?
A peptide can be perfectly synthesized and still arrive degraded — if the shipping wasn't handled right. Here's what cold-chain shipping actually involves, and why it matters before the vial ever reaches a lab bench.
Sep 13, 2026
What Is Peptide Reconstitution? A Complete Guide
A lyophilized peptide is stable for years. Once it's reconstituted, the clock starts running. Here's what reconstitution actually involves, and why the solvent you pick matters.
Sep 9, 2026
What Is Mass Spectrometry (LC-MS) in Peptide Testing?
HPLC tells you how pure a peptide is. It doesn't tell you what it actually is. That's where mass spectrometry comes in — here's how LC-MS confirms identity, not just purity.
Sep 5, 2026
What Is Lyophilization? Why Peptides Come as a Powder
Why do research peptides ship as a dry powder instead of a liquid? The freeze-drying process behind it, and why it's the difference between years of stability and days.
Sep 3, 2026
What Is a Certificate of Analysis (COA)?
A real COA is more than a purity number — it's a lab report tied to your exact batch. Here's what it should include, and the red flags that mean it isn't worth trusting.
Sep 1, 2026
What Is HPLC? How Peptide Purity Gets Measured
That "99% pure" number on a vial comes from one specific test: HPLC. Here's how it actually works, what a chromatogram is showing you, and what the purity percentage doesn't tell you.
Aug 29, 2026
What Is an Amino Acid? The Building Block Explained
An amino acid is a small organic molecule with an amino group, a carboxyl group and a variable side chain. Here is how they link into peptides and why their order matters in the lab.
Aug 27, 2026
What Is a Peptide? A Plain-English Primer
A peptide is just a short chain of amino acids — but that simple structure is why these molecules act as precise signals rather than building blocks. Here's what actually separates a peptide from a protein.
Aug 26, 2026
What Are Research Peptides? The Complete Guide
"Research peptide" isn't just a label on a vial — it points to a specific production method, a specific testing standard, and a specific intended use. Here's what actually separates a credible product from a vague one.
