Learn
Guides for peptide researchers
Practical, plain-English explainers on quality, handling and pharmacology. No dosing, no hype.
How to choose a research peptide supplier: a UK buyer's checklist
Ten checks to run before ordering research peptides: batch-matched CoAs, independent testing, transparent pricing, clear labelling and honest claims.
Read the guide →Peptide price per mg: how to compare vials properly
Why price per vial misleads, how to calculate price per mg and net-peptide price, and how pack sizes change what you really pay.
Read the guide →HPLC vs mass spectrometry: what each test tells you about a peptide
HPLC measures purity, mass spectrometry confirms identity. Why a CoA needs both, what each cannot detect and how to read the results.
Read the guide →Batch verification and traceability: proving a CoA belongs to your vial
How batch numbers, lab references and online lookups connect a Certificate of Analysis to the vial in your hands, and what to do when they do not match.
Read the guide →Research peptide red flags: warning signs on supplier sites and CoAs
The patterns that separate documented suppliers from risky ones: missing batch data, perfect-looking numbers, human-use claims and pressure tactics.
Read the guide →TFA vs acetate peptide salts: why the counter-ion matters
Synthetic peptides are supplied as salts. What trifluoroacetate and acetate counter-ions are, why they change net content and when the choice matters.
Read the guide →Semaglutide vs tirzepatide vs retatrutide: the three incretin peptides compared
How the three best-known incretin research compounds differ in receptor targets, evidence and regulatory status, with links to each head-to-head comparison.
Read the guide →How peptide evidence levels work: what a 1 to 5 rating means
The rubric behind peptide.wiki's evidence levels, how a compound moves up or down and why a high rating is about data quality, not suitability.
Read the guide →Planning peptide inventory for a research project
How to work out total quantity, choose vial sizes, track batches and avoid waste when sourcing research peptides for a laboratory project.
Read the guide →Peptide solubility basics: how sequence decides what dissolves
Why some peptides dissolve in water and others need acid, base or organic solvent: net charge, hydrophobic residues and the logic of choosing a solvent.
Read the guide →Understanding regulatory status labels: approved, regional, investigational, unapproved
What each regulatory status on peptide.wiki means, why research-grade material is never the approved medicine and how to read a status line responsibly.
Read the guide →How to read a peptide Certificate of Analysis
What each line of a peptide CoA means, which checks matter most, and the red flags that suggest a document is decoration rather than evidence.
Read the guide →Purity versus net peptide content: why 99% is not 99%
HPLC purity and net peptide content measure different things. Understand the gap, why vials contain counter-ions and water, and how it affects solution concentrations.
Read the guide →Incretin and amylin peptides explained: GLP-1, GIP, glucagon and amylin
A plain-English map of the receptors behind semaglutide, tirzepatide, retatrutide, cagrilintide and the earlier GLP-1 analogues, and how each added a target.
Read the guide →Growth hormone secretagogues explained: GHRH analogues versus ghrelin mimetics
Two receptors, two families. How sermorelin, CJC-1295 and tesamorelin differ from ipamorelin, GHRP-6 and hexarelin, and why the distinction matters for research design.
Read the guide →The melanocortin system explained: MC1R to MC5R
A guide to the five melanocortin receptors and the compounds studied at each, from afamelanotide and melanotan II to PT-141 and setmelanotide.
Read the guide →How research peptides are made and tested
From solid-phase synthesis to preparative HPLC, freeze-drying and quality control: what happens between an amino acid sequence and a vial.
Read the guide →Handling lyophilised peptides in the laboratory: stability basics
General principles for keeping freeze-dried research peptides stable: moisture, temperature, light and freeze-thaw, plus why solutions behave differently from powders.
Read the guide →Intranasal peptide delivery: what the research literature actually shows
Why peptides are studied as nasal formulations, the biological barriers involved, what is known about nose-to-brain transport, and why claims about nasal sprays deserve caution.
Read the guide →Lyophilised vials vs pre-filled pens: comparing research peptide formats
How freeze-dried vials and pre-filled solution pens differ for laboratory research: stability, concentration labelling, price per mg and what to check on a CoA.
Read the guide →