Research Library

Explore our collection of research articles, guides, and protocol documentation.

Peptide Education

Peptides That Help With Weight Loss: What Clinical Trials Actually Show

A small group of incretin-based peptides reduced body weight versus placebo in controlled human trials. Most peptides sold for weight loss have no comparable data.

Research Assistant10 min readNov 4, 2026

Peptide Education

Epitalon vs Humanin: A Tetrapeptide and a 24-Mer Compared

Both Epitalon and humanin turn up in longevity-adjacent peptide research, which makes it easy to assume they are variations on a theme. They are not. One is a four-residue synthetic chain modeled on a pineal gland extract; the other is a 24-residue peptide encoded inside the mitochondrial genome. This comparison walks through the sequences, the origins, what chain length does to structure, and what cell-culture research has actually reported for each.

Research Assistant14 min readNov 2, 2026

Peptide Education

Semax vs Selank: ACTH(4-10) vs Tuftsin Peptide Scaffolds

Semax and Selank are both seven residues long and both end in the same three amino acids, which is why they get discussed as a pair. The difference lives in their front halves: Semax carries a fragment of a pituitary hormone, Selank carries a fragment of an antibody. We trace both scaffolds back to their parent peptides, explain what the shared Pro-Gly-Pro tail contributes to stability, and set the two structures side by side.

Research Assistant14 min readOct 31, 2026

Peptide Education

Tesamorelin vs Sermorelin: GHRH Analog N-Terminal Chemistry

Sermorelin and tesamorelin are both growth hormone-releasing hormone analogs that engage the same pituitary receptor, yet they solve the same chemical problem in opposite ways. One truncates the native peptide to its first 29 residues and leaves the front end exposed. The other keeps all 44 residues and caps the amino terminus with a six-carbon acyl chain. This explainer walks through the sequences, the enzyme that cleaves them, and why the N-terminus is the one region of a GHRH analog that cannot be touched.

Research Assistant14 min readOct 13, 2026

Peptide Education

Ipamorelin vs Hexarelin: Pentapeptide vs Hexapeptide GHS

Ipamorelin and hexarelin sit one amino acid residue apart, and that single residue is the least interesting thing separating them. This structural comparison walks both sequences from end to end, identifies the conserved pharmacophore the GHRP family carries forward, and explains why hexarelin's documented affinity for the scavenger receptor CD36 — a target ipamorelin is not reported to share — opens an entire line of published research that has nothing to do with growth hormone release at all.

Research Assistant14 min readOct 13, 2026

Peptide Education

Net Peptide Content vs HPLC Purity: Two Different Numbers

A vial can be certified 98% pure by HPLC and still be less than half peptide by weight — and both numbers can be correct. HPLC purity is a ratio among peptide species; net peptide content is a fraction of total mass. This explainer separates the two, shows what counterions, water and residual solvent contribute to the gap, and outlines what a complete certificate of analysis should carry.

Research Assistant15 min readSep 29, 2026

Peptide Education

Bacteriostatic Water Chemistry: Benzyl Alcohol vs Sterile Water

Bacteriostatic water and preservative-free sterile water look identical and differ by a single ingredient present at under one percent. That ingredient is benzyl alcohol, a small aromatic solvent that binds protein surfaces and shifts peptides toward aggregation-prone conformations. This article covers the chemistry of the preservative, what bacteriostatic actually means versus sterile, what model-system stability data shows at the exact concentrations used commercially, and why pH and container materials complicate the comparison on both sides.

Research Assistant13 min readSep 25, 2026

Peptide Education

Oxidation, Deamidation, and Hydrolysis: The Three Peptide Degradation Pathways

A peptide sitting in a vial is not chemically inert. Three ordinary reactions — oxidation, deamidation, and hydrolysis — account for most of what changes in a stored sample, and each one leaves a signature you can predict from sequence alone. This explainer walks through the mechanism behind each pathway, the amino acid motifs that flag a molecule as vulnerable, and the environmental variables that decide how fast any of it happens.

Research Assistant14 min readSep 11, 2026

Peptide Education

Reversed-Phase HPLC: How Peptide Purity Is Measured

A certificate of analysis says a peptide is 98% pure by HPLC — but what does that number actually describe? This guide walks through how reversed-phase HPLC separates a peptide from its impurities, how the chromatogram becomes a purity percentage, and where the method's assumptions run out.

Research Assistant10 min readAug 13, 2026

Peptide Education

Beta-Turn Motifs in Peptides: Why Proline and Glycine Matter

Peptides rarely run in a straight line — they fold back on themselves at tight four-residue features called beta turns. Two amino acids, proline and glycine, show up at those corners far more than chance predicts. This explainer walks through what a beta turn is, why each residue fits, and how chemists use the same logic to design peptides on purpose.

Research Assistant12 min readJul 24, 2026

Peptide Education

Gonadorelin Structure: The GnRH Decapeptide and Its Receptor

Gonadorelin is the synthetic version of gonadotropin-releasing hormone, built from just ten amino acids. This overview walks through its decapeptide sequence, the terminal caps that protect it, the beta-turn shape that lets it fit its target, and the unusual class A GPCR — a receptor missing the tail most GPCRs carry — that it binds.

Research Assistant11 min readJul 8, 2026

Peptide Education

Humanin Peptide Structure: Inside a 24-Residue Mitochondrial-Derived Peptide

Humanin is a rare peptide read out of the mitochondrion's own genome rather than the cell nucleus. This explainer walks through its 24-residue sequence, its three-turn alpha-helix, the potent S14G research analog, and how its compact structure maps onto the receptors and intracellular partners researchers study it against.

Research Assistant12 min readJul 6, 2026

Peptide Education

Kisspeptin-10 Structure: The KISS1R Decapeptide Explained

Kisspeptin-10 is only ten amino acids long, yet researchers treat it as the active core of a much larger signaling system. This explainer walks through its sequence, where it comes from, the amidated tail that does the real work, its short helix, and the KISS1R receptor it was built to recognize.

Research Assistant9 min readJun 28, 2026

Peptide Education

The Peptide Bond at the Chemistry Level: Amide Chemistry Explained

Every peptide and protein is a chain held together by one repeating link. This explainer walks through the peptide bond at the chemistry level — how it forms by condensation, why resonance locks it flat, the difference between its cis and trans faces, and why a single bond can sit in water for centuries without breaking.

Research Assistant12 min readJun 20, 2026

Peptide Education

Native Chemical Ligation: How Long Peptides Get Built From Smaller Pieces

Chemists can write any peptide sequence on paper, but the machinery that builds them runs out of steam after a few dozen residues. Native chemical ligation is the reaction that gets around that limit, joining separately made fragments into one long, native chain. Here is how it works, why it needs a cysteine, and how researchers stitch three or more pieces together.

Research Assistant12 min readJun 18, 2026

Peptide Education

Solid-Phase Peptide Synthesis Step-by-Step: From Fmoc to Cleavage

Synthetic peptides are assembled one amino acid at a time on a tiny resin bead. This step-by-step guide walks through solid-phase peptide synthesis the way it actually runs in the lab — the Fmoc protecting-group logic, the repeating deprotection-and-coupling loop, and the final cleavage that frees the finished chain.

Research Assistant10 min readJun 17, 2026

Peptide Education

Peptide Mass Spectrometry Sequence Verification: How Researchers Confirm What's in the Vial

A label can claim a vial holds a specific peptide, but proving it takes more than weighing the molecule. Here's how mass spectrometry reads a peptide's sequence — from ionization to fragment ladders to database matching — and why researchers trust convergence over any single number.

Research Assistant12 min readJun 16, 2026

Peptide Education

Peptide Endotoxin LAL Test Explained: What the Number on Your COA Really Measures

The endotoxin line on a certificate of analysis is one of the most misread numbers in research peptides. It is not a purity score and not a sterility check. Here is what the LAL test actually measures, how a result becomes a number in Endotoxin Units, why a clean-looking batch can still fail, and where the method is heading with recombinant Factor C.

Research Assistant12 min readJun 15, 2026

Peptide Education

How to Dissolve a Research Peptide Properly: A Solubility Guide

Two peptide vials can look identical on the bench and behave completely differently in solvent. Dissolution is sequence chemistry, not a fixed recipe. This guide walks through the molecular logic of peptide solubility, when pure water suffices, when to reach for DMSO or fluorinated alcohols, how the isoelectric point governs precipitation, and the common laboratory mistakes that spoil a solubilization attempt.

Research Assistant14 min readJun 1, 2026

Peptide Education

What Tests Do Researchers Actually Run on Peptides? A Plain Tour of In-Vitro Assays

When a peptide paper says 'Western blot confirmed' or '98% purity by HPLC,' what is the methods section really pointing to? This article walks through the standard in-vitro toolkit researchers use on peptides — from identity and purity testing to cell-culture readouts to gene-expression assays — and shows how to read those sections without overclaiming what they prove.

Research Assistant14 min readMay 29, 2026

Peptide Education

What Does 95%, 98%, and 99% Purity Mean on a Peptide Label?

A peptide label that says 99% purity does not promise an absolute mass fraction or guarantee identity. It reports one number from one method — an HPLC area percent measured at a fixed wavelength. Here is what the figure is actually measuring, what the missing 1-5% typically contains, and how to read the rest of the certificate of analysis so the percentage means what you think it means.

Research Assistant14 min readMay 27, 2026

Peptide Education

How to Store Research Peptides So They Stay Stable: A Laboratory Handling Guide

A practical, citation-backed guide to keeping research peptides chemically intact: why the lyophilized form is the stable form, the temperature targets that show up in the peer-reviewed literature, how freeze-thaw exposure damages material, and the bench-side handling habits that decide whether a vial is still the same molecule a year after it arrives.

Research Assistant12 min readMay 19, 2026

Peptide Education

Why Research Peptides Come as a White Powder: Lyophilization Explained

Open a vial of research-grade peptide and you find a small white cake instead of a liquid. That choice of physical form isn't arbitrary. This explainer walks through what lyophilization is, the three process stages, why dry solid form preserves the molecule better than solution, what the powder is actually made of, and how to read what you see in the vial when it arrives.

Research Assistant15 min readMay 15, 2026

Peptide Education

How Are Synthetic Peptides Actually Made? A Plain Look at the Process

If you have ever wondered how a vial of a research-grade peptide actually comes into being, this is a plain-language tour: anchored amino acids on tiny beads, a four-step coupling round repeated until the chain is finished, then cleavage, HPLC purification, and a certificate of analysis that maps neatly back to every step in the process.

Research Assistant12 min readMay 8, 2026

Peptide Education

Peptides Bodybuilders Use for Muscle Growth | Optides

Peptides have become a major topic in bodybuilding for muscle growth and recovery. Here’s a clear breakdown of what’s being used and why it matters.

Research Assistant4 min readApr 26, 2026

Peptide Education

Are Peptides Legal in 2026? Research Use Explained

Peptides occupy a nuanced space in U.S. law — legal to buy and possess for research, but tightly regulated when it comes to how they're marketed and used. Understanding that distinction is what separates a compliant purchase from a risky one. This guide breaks down exactly where the legal lines are drawn in 2026.

Research Assistant5 min readApr 15, 2026