Every peptide has a molecular mass determined largely by its chemical structure. A short peptide such as KPV is dramatically smaller than a large peptide or polypeptide such as IGF-1 LR3. But amino-acid count is only part of the story. Two peptides containing the same number of amino acids can have very different molecular weights....Read More

A peptide supplier provides a Certificate of Analysis showing excellent results. The report includes: 99%+ HPLC purity and: mass spectrometry consistent with the expected peptide. Does that prove the vial in front of you contains exactly the material described on the report? Not automatically. A Certificate of Analysis provides evidence about the sample that was...Read More

A peptide Certificate of Analysis reports: 99% purity. At first glance, that sounds definitive. Surely a peptide that is 99% pure must also be the correct peptide? Not necessarily. Purity and identity are different analytical questions. A sample can potentially produce a chromatogram dominated by one component while that dominant component is not the intended...Read More

A peptide arrives as a neat white powder. The lyophilised cake looks clean. There are no obvious particles. Everything appears exactly as expected. So does that mean the peptide is pure? No. You cannot reliably determine peptide purity simply by looking at a research sample. Colour, powder volume, cake shape and general appearance may provide...Read More

Many research peptides are supplied not as liquids but as dry powders. The technical term commonly used for this process is: lyophilisation or: freeze-drying. But why are peptides lyophilised in the first place? The main reason is stability. Peptides are complex molecules that can be vulnerable to chemical and physical degradation. Removing most of the...Read More

BPC-157 and TB-500 are two of the most frequently compared compounds in peptide research. They are commonly grouped together because both appear in experimental literature and online discussions involving tissue biology, repair mechanisms and cellular responses to injury. But this can create a misleading impression: BPC-157 and TB-500 are not versions of the same peptide....Read More

BPC-157 and TB-500 are two of the most frequently compared compounds in peptide research. They are commonly grouped together because both appear in experimental literature and online discussions involving tissue biology, repair mechanisms and cellular responses to injury. But this can create a misleading impression: BPC-157 and TB-500 are not versions of the same peptide....Read More

KPV is one of the shortest peptides commonly encountered in research. It contains only three amino acids: Lysine — Proline — Valine or: K — P — V But the interesting part of KPV is not simply its size. KPV corresponds to the final three amino acids of alpha-melanocyte-stimulating hormone, better known as alpha-MSH. This...Read More

IGF-1 LR3 is frequently discussed within growth-factor and peptide research, but the name itself can be confusing. What does IGF-1 mean? What does LR3 mean? And is IGF-1 LR3 simply another name for naturally occurring IGF-1? The short answer is no. IGF-1 stands for Insulin-Like Growth Factor 1. LR3 refers to Long R3, an engineered...Read More

Tesamorelin is frequently discussed alongside growth hormone, Ipamorelin, CJC-1295 and IGF-1. That can make its actual identity surprisingly confusing. Is Tesamorelin growth hormone? No. Tesamorelin is not human growth hormone (HGH). It is a synthetic analogue of growth hormone-releasing hormone, or GHRH. This distinction matters because GHRH and growth hormone occupy different positions within the...Read More