The two get grouped together constantly, but they are separate classes of molecule with nothing structural in common. Steroids are built on a four-ring carbon skeleton derived from cholesterol; peptides are chains of amino acids. A look at what each class actually is, how they act on cells differently, and where the confusion comes from.
Read the article →A COA is only as useful as your ability to read it. We walk through each section of a typical certificate — identity confirmation, purity percentage, mass verification, and residual solvent screening — and explain what a well-formed result looks like versus one that leaves questions open.
Read →High-performance liquid chromatography is the backbone of purity verification. Here's how the technique separates a sample into its components, and what the resulting chromatogram is really showing you.
Read →A single purity figure can be calculated several different ways depending on the method used. We look at why two labs can report different values for the same vial, and which figure is worth anchoring to.
Read →Purity tells you how much of the sample is the intended compound. Mass spec tells you whether it's the right compound at all. A look at why both measurements belong on every certificate.
Read →Freeze-drying isn't just a packaging choice — it directly affects long-term stability. What the process does at a structural level, and how storage conditions carry that forward.
Read →When a product combines multiple compounds, verifying the ratio is a separate measurement from verifying each component. Here's what that testing looks like and how it's reported.
Read →"Sempre viva" means "always alive." This is a research supply company focused on the long game. This space is where we write about new innovations in peptide technology and the analytical side of that work: how testing is done, what the resulting documentation means, and why the details are worth caring about.
All products are tested for purity, mass measurements, and blend ratios here in the United States.