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Explainers, analysis, comparisons, and a guide to every peptide on the site — written from primary sources and attributed, never paraphrased opinion.
Explainers (16)
Plain-language explainers — the basics, clearly.
What is a Certificate of Analysis (COA)?
A Certificate of Analysis is the document that separates a vendor's marketing claims from lab-verified data. Here is what it contains, who issues it, and how to read one critically.
What is lyophilized (freeze-dried) peptide powder?
Lyophilized peptide powder is the standard shipping format for research peptides. Here is what the freeze-drying process involves, why it matters for stability, and what to look for when you receive a vial.
Peptide half-life and why it shapes dosing frequency
How a peptide's half-life determines how long it stays active in the body, and why chemical modifications can stretch that window from minutes to days.
What is net peptide content?
Net peptide content tells you how much of a vial's powder is actual peptide rather than water, salts, or leftover solvents. It matters alongside purity when you compare research peptide products.
How to read an independent peptide test report
Purity, net peptide content, and identity are three different numbers. Here's what each one means on a certificate of analysis.
What "GMP" and "cGMP" mean
What GMP and cGMP mean, and why the distinction matters when you evaluate peptide suppliers and lab results.
What ISO/IEC 17025 accreditation means for a lab
ISO/IEC 17025 accreditation signals that a testing laboratory has been independently verified for technical competence. Here is what the standard requires, who grants accreditation, and why it matters when evaluating peptide lab reports.
Endotoxins, and why labs test for them
What bacterial endotoxins are, why trace amounts pose serious risks in injectable products, and how labs measure and report contamination in EU/mL.
What "research use only" actually means
Why peptides sold for research carry a "research use only" label, what the FDA's formal RUO framework actually covers, and what that label increasingly does not protect a vendor from.
What is HPLC purity testing?
A plain-language guide to what HPLC purity testing measures, how the percentage is calculated, where it falls short, and why all of that matters when you evaluate peptide quality.
What is a GLP-1 receptor agonist?
Semaglutide, tirzepatide, and related compounds all act on the same receptor. Here is what GLP-1 receptor agonists are, how researchers describe their mechanism, and where the approved drugs end and research-grade territory begins.
What is a peptide CDMO?
A plain-language guide to the contract manufacturers behind the peptides sold for research: who they are, what they do, and why they sit at the center of the supply chain.
Peptide salt forms: acetate and TFA explained
Counter-ions like acetate and TFA attach to peptide molecules during synthesis. Knowing which one you have helps you read a certificate of analysis and compare products accurately.
What is mass-spectrometry identity confirmation?
Mass spectrometry checks whether a peptide is actually the molecule it claims to be. Here is how the technique works, and why identity testing matters beyond purity alone.
Why peptides need cold storage and a cold chain
Peptides are chemically reactive and degrade through several pathways. Here is what the research and manufacturer guidance say about why cold storage and an intact cold chain matter from synthesis to use.
Bacteriostatic water vs sterile water vs saline
A plain-language breakdown of the three most common reconstitution solvents: what sets them apart, and why the choice matters for research use.
Analysis (24)
Industry & technical analysis of the market and methods.
Why Asian API manufacturers underpin the supply
China, South Korea, and Taiwan supply most of the world's peptide active pharmaceutical ingredients. Here is how that upstream capacity reaches the global research market, and how independent testing services track quality along the way.
BPC-157 and TB-500: what the research actually supports versus the popular claims
Two of the most-hyped repair peptides rest almost entirely on animal data. Here is what is published, what is missing, and where they stand with regulators.
The BIOSECURE Act and the peptide supply chain
US legislation targeting designated Chinese biotech firms is changing how peptides move from synthesis to end buyer. Here is what is known as of mid-2026.
Purity, potency, and net content: a technical breakdown
A peptide certificate of analysis usually carries three numbers: purity, potency, and net content. They measure different things, and confusing them produces misleading price comparisons.
What a "verified COA" actually verifies
A lab report stamped "verified" tells you more than a vendor's word, but less than most buyers assume. Here is what report verification actually checks, and what it leaves unanswered.
What independent third-party testing actually reveals about research peptides
Aggregating the public testing record from Finnrick, VialAudit, Peptigrity and labs like Janoshik: where the numbers agree, where they don't, and what a purity figure leaves out.
Comparisons (15)
Head-to-head comparisons of compounds, vendors, and labs.
BPC-157 vs TB-500
BPC-157 and TB-500 are the two most-discussed repair peptides in the research literature. Both are studied for tissue effects, but they come from different sources and are described by different proposed mechanisms. Neither is approved for human use, and the FDA restricted both from US compounding in 2023.
Retatrutide vs Tirzepatide
A neutral look at how retatrutide's triple-receptor mechanism compares to tirzepatide's dual agonism, based on published trial readouts through mid-2026.
CJC-1295 vs Sermorelin vs Ipamorelin
A side-by-side look at how CJC-1295, Sermorelin, and Ipamorelin differ in mechanism, half-life, and selectivity, based on what the research literature reports.
Bachem vs PolyPeptide vs AmbioPharm: CDMOs
A neutral look at three major pharma-grade peptide CDMOs: Bachem, PolyPeptide Group, and AmbioPharm. We cover country of operation, ownership, manufacturing footprint, and publicly stated regulatory credentials, as of mid-2026.
Ipamorelin vs GHRP-6 vs Hexarelin
A side-by-side look at three ghrelin-axis peptides (ipamorelin, GHRP-6, and hexarelin) and what the research literature reports about their selectivity profiles and diverging side effects.
MOTS-c vs other metabolic peptides
MOTS-c is a mitochondria-derived peptide. GLP-1 receptor agonists work through gut-hormone and CNS signalling. Two distinct pathways researchers are studying for metabolic health.
Peptide guides (92)
A sourced overview for each compound on the site — what it is, the state of the research, regulatory status, and the independent-testing picture.