Blog
US research peptides blog
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
Every peptide is built from the same 20 amino acids, arranged in a specific order. A look at their structure, and why getting that sequence exactly right is the whole game.
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.