Quality
2 min read
Peptide purity vs peptide content: what the numbers mean
A purity percentage and a quantity in milligrams describe different things. Here is how to read them together without assuming more than a report shows.
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Explore the science behind research peptides, the meaning of analytical results, and the details that matter in the laboratory.
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Start with the evidence. Explain what it shows, acknowledge what it cannot establish, and make technical information easier to understand. Our articles bring that approach to compound profiles, quality documentation and laboratory practice.
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Latest articles
22 articles · Newest first
Quality2 min readHPLC and mass spectrometry: two different views of a peptide
Why peptide reports often include both a chromatogram and a mass spectrum, and what researchers can learn from each.
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Quality2 min readPurity, sterility and endotoxins: three separate questions
Chemical purity does not establish sterility or an endotoxin result. A guide to keeping these measurements separate when reviewing research materials.
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Lab notes2 min readPeptide stability: why a storage temperature is only part of the story
How to separate a handling recommendation from measured stability, and which details to record when reviewing a peptide's storage history.
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Compound profile8 min readGHK-Cu (copper peptide): where the research stands
A literature-grounded overview of the copper tripeptide GHK-Cu — its copper-carrier biochemistry, the modern gene-expression research, its skin and matrix biology, and where the evidence is solid versus speculative.
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Compound profile8 min readMOTS-c: the mitochondrial-derived peptide, explained
What MOTS-c is, why a peptide encoded in the mitochondrial genome is biologically remarkable, its AMPK and metabolic signalling, the nuclear-translocation finding, and the honest state of the human evidence.
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Compound profile9 min readEpitalon and the bioregulator peptides: claims versus evidence
A careful look at Epitalon — the tetrapeptide bioregulator, its telomerase and pineal research, the research lineage it comes from, and why its extraordinary claims need the ordinary standard of independent replication.
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Compound profile8 min readPT-141 (Bremelanotide): melanocortin pharmacology explained
PT-141 is one of the few research-catalogue compounds whose parent molecule became an approved medicine. An overview of its MC3R/MC4R melanocortin mechanism, its relationship to Melanotan II, and its unusually clear regulatory picture.
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How-to3 min readStoring research peptides: temperature, shelf life and handling
A practical laboratory workflow for receiving, storing and documenting research peptides, using conditions and holding periods supported for the specific material.
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Compound profile9 min readTB-500 (Thymosin Beta-4): where the research stands
A literature-grounded overview of TB-500 — what it actually is, how it differs from full-length Thymosin Beta-4, the actin-regulation mechanism, the preclinical evidence, and how it compares with BPC-157.
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Compound profile9 min readNAD+ in research: metabolism, ageing and the salvage pathway
What NAD+ is, why it is central to metabolism and sirtuin/PARP signalling, the salvage pathway and its precursors NMN and NR, where the ageing research focus sits, and the delivery problem that shapes the field.
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Trends9 min readThe most-studied research peptides in 2026
A rundown of the seven research compounds seeing the most attention in current peptide research — NAD+, 5-Amino-1MQ, MOTS-c, SS-31, Epitalon, CJC-1295 With DAC and Thymalin. Each with the literature context.
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How-to8 min readResearch peptides for beginners: a UK researcher's guide
Plain-language orientation for researchers new to peptide work — what the categories are, what to look for in a supplier, what mistakes to avoid, and where to start.
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How-to10 min readHow to reconstitute lyophilised research peptides — the proper way
The standard lab approach to reconstituting freeze-dried peptides: choosing solvent, the step-by-step technique, storage after reconstitution, and the most common mistakes that waste material.
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Quality11 min readBuying research peptides in the UK: the legal landscape explained
Where research peptides sit in UK law, what "Research Use Only" actually means, who can purchase, and what to look for in a UK supplier. Practical orientation for researchers.
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Compound profile9 min readBPC-157 vs TB-500: what's the research difference?
A structural and mechanistic comparison of the two most-studied tissue research peptides. How they actually differ, where the published research focuses, and when to use each in in-vitro experimental design.
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Compound profile10 min readSermorelin, CJC-1295, Tesamorelin: GHRH analogues compared
The four most-studied GHRH analogues side by side — Sermorelin, CJC-1295 No DAC, CJC-1295 With DAC, and Tesamorelin. Structure, half-life, and which is the right research tool for what.
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Quality3 min readBatch testing and COAs: understanding the source of the evidence
How manufacturer certificates differ from independent laboratory reports, and why the connection between a tested sample and supplied stock matters.
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Quality6 min readCold-chain shipping for research peptides: when it matters
When cold-chain shipping is essential, when it's a premium upsell that adds no functional value for the buyer, and how to think about the decision for your specific compound and transit conditions.
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Quality3 min readHow to read a peptide certificate of analysis
A practical checklist for reviewing identifiers, results, specifications and missing information on a peptide certificate of analysis.
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Compound profile9 min readBPC-157: where the research currently stands
A literature-grounded summary of BPC-157 — its origin, sequence, the preclinical research, and the open questions. No claims, just the evidence.
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Compound profile10 min readCJC-1295, Ipamorelin, GHRP-6: how the GH secretagogues compare
A structural and receptor-level comparison of the three most common GH secretagogue research peptides — sequence, receptor target, half-life, and published experimental context.
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