Certificates of analysis from Horizon Analytical are published for every compound we list.
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People's Peps Research Library
Insights
Research-orientation guides on peptide methodology, certificate of analysis evaluation, supplier assessment and analytical literature for the research community.
- Methodology reference
- Lab verification
- Research community
Laboratory Research Compounds
for Analytical and In-Vitro Research
Peptide Science
Semax vs Selank: How the Two Compounds Differ
Selank vs Semax compared on structure and mechanism: different parent molecules, a shared Pro-Gly-Pro motif, and what the comparative literature establishes.
Learn morePeptide Science
Selank: Structure, Mechanism and Research Context
Selank explained: the tuftsin-derived Thr-Lys-Pro-Arg-Pro-Gly-Pro heptapeptide, its molecular mass, the pathways the literature examines, and evidence limits.
Learn morePeptide Science
Semax: Structure, Mechanism and Research Context
Semax peptide explained: the ACTH(4-7) Pro-Gly-Pro heptapeptide sequence, molecular mass, the pathways the literature examines, and the limits of that evidence.
Learn morePeptide Science
Copper Peptides: Research-Grade GHK-Cu vs Cosmetic Formulations
Copper peptide explained: how INCI copper tripeptide-1 in a cosmetic serum differs from characterised research-grade GHK-Cu in purity, format and regulation.
Learn morePeptide Science
GHK-Cu Research: What the Published Literature Reports
A primary-source review of GHK-Cu peptide research: the models used, the endpoints measured, reported concentrations, and what cell studies show about copper.
Learn morePeptide Science
GHK-Cu: The Copper-Binding Tripeptide Explained
GHK-Cu peptide explained: the Gly-His-Lys sequence, the copper(II) coordination site, molecular mass, and what the in-vitro literature actually examines.
Learn morePeptide Science
How Peptides Are Made: Solid-Phase Peptide Synthesis Explained
How peptide synthesis works, step by step: solid-phase peptide synthesis, Fmoc chemistry, resins, coupling reagents, HPLC purification and lyophilization.
Learn morePeptide Science
Types of Peptides: How Peptides Are Classified
Peptides are classified by chain length, structure, biosynthetic origin, source and chemistry. A clear guide to oligopeptides, polypeptides and lab grades.
Learn moreLaboratory Practice
Peptide Testing and Purity: How to Read a Certificate of Analysis
Peptide testing explained: how to read a certificate of analysis field by field, what HPLC purity and net peptide content mean, and the red flags to check.
Learn moreLaboratory Practice
How to Store Peptides: A Laboratory Guide to Peptide Storage and Stability
How to store peptides in the lab: degradation chemistry, temperature tiers, freeze-thaw, moisture, containers, and the records that keep results traceable.
Learn morePeptide Science
What Are Peptides? A Beginner's Guide to Peptide Science
What are peptides? A clear beginner's guide to amino acids, peptide bonds, sequence notation, and how peptides differ from polypeptides and from proteins.
Learn moreRegulatory & Compliance
Are Peptides Legal? RUO Status and What the Law Actually Says in 2026
What "legal peptides" and "research use only" actually mean under US law, what the 2026 FDA advisory vote did and did not change, and how to read a supplier.
Learn moreAll products are intended solely for in vitro laboratory research purposes. Not approved for human or veterinary use, not medicines, and not intended for diagnosis, treatment, or prevention of any disease. Not for human consumption. By purchasing, you confirm you are 21 or older and that products will be handled only by qualified researchers in a suitable laboratory setting.
Research Use Only Important Disclaimer
COA on every product
Our products are intended for qualified researchers and appropriately equipped facilities.
They are not approved for use in or on humans or animals, and they must not be described, marketed or used as such.
All products sold by People's Peps are strictly intended for laboratory research and development purposes only. They are not for human or veterinary consumption, and must not be used to diagnose, treat, cure, or prevent any disease.
Blog Insights
Explore Our Latest Articles
Peptide ScienceSemax vs Selank: How the Two Compounds DifferSelank vs Semax compared on structure and mechanism: different parent molecules, a shared Pro-Gly-Pro motif, and what the comparative literature establishes.
Peptide ScienceSelank: Structure, Mechanism and Research ContextSelank explained: the tuftsin-derived Thr-Lys-Pro-Arg-Pro-Gly-Pro heptapeptide, its molecular mass, the pathways the literature examines, and evidence limits.
Peptide ScienceSemax: Structure, Mechanism and Research ContextSemax peptide explained: the ACTH(4-7) Pro-Gly-Pro heptapeptide sequence, molecular mass, the pathways the literature examines, and the limits of that evidence.
Peptide ScienceCopper Peptides: Research-Grade GHK-Cu vs Cosmetic FormulationsCopper peptide explained: how INCI copper tripeptide-1 in a cosmetic serum differs from characterised research-grade GHK-Cu in purity, format and regulation.
Peptide ScienceGHK-Cu Research: What the Published Literature ReportsA primary-source review of GHK-Cu peptide research: the models used, the endpoints measured, reported concentrations, and what cell studies show about copper.
Peptide ScienceGHK-Cu: The Copper-Binding Tripeptide ExplainedGHK-Cu peptide explained: the Gly-His-Lys sequence, the copper(II) coordination site, molecular mass, and what the in-vitro literature actually examines.
Peptide ScienceHow Peptides Are Made: Solid-Phase Peptide Synthesis ExplainedHow peptide synthesis works, step by step: solid-phase peptide synthesis, Fmoc chemistry, resins, coupling reagents, HPLC purification and lyophilization.
Peptide ScienceTypes of Peptides: How Peptides Are ClassifiedPeptides are classified by chain length, structure, biosynthetic origin, source and chemistry. A clear guide to oligopeptides, polypeptides and lab grades.
Laboratory PracticePeptide Testing and Purity: How to Read a Certificate of AnalysisPeptide testing explained: how to read a certificate of analysis field by field, what HPLC purity and net peptide content mean, and the red flags to check.
Laboratory PracticeHow to Store Peptides: A Laboratory Guide to Peptide Storage and StabilityHow to store peptides in the lab: degradation chemistry, temperature tiers, freeze-thaw, moisture, containers, and the records that keep results traceable.
Peptide ScienceWhat Are Peptides? A Beginner's Guide to Peptide ScienceWhat are peptides? A clear beginner's guide to amino acids, peptide bonds, sequence notation, and how peptides differ from polypeptides and from proteins.
Regulatory & ComplianceAre Peptides Legal? RUO Status and What the Law Actually Says in 2026What "legal peptides" and "research use only" actually mean under US law, what the 2026 FDA advisory vote did and did not change, and how to read a supplier.
Important: Please read before you order
People's Peps supplies research chemicals and reference materials for laboratory use. By placing an order, you confirm that you have read, understood and agreed to the terms below.
- For laboratory research use only. All products are sold exclusively for in-vitro laboratory research and analytical purposes. They are not intended and must not be used for human or animal consumption, or for any medicinal, therapeutic, diagnostic, clinical, cosmetic or household purpose.
- Not medicines or consumer products. None of the items we sell are medicines, medical products, supplements, foods or cosmetics. They are not approved for use in or on humans or animals, and they must not be described, marketed or used as such.
- Eligibility. Our products are intended for qualified researchers and appropriately equipped facilities. By ordering, you confirm that you are 21 or older, that you are a qualified researcher or purchasing for a research organization, and that you are purchasing in a professional or research capacity.
- Your responsibility. You are responsible for ensuring that your purchase, possession and intended use comply with all laws and regulations that apply to you. We give no advice on use and make no representation that any product is fit for any purpose other than laboratory research. People's Peps accepts no liability for any misuse of our products, or for any loss, injury or other outcome arising from their use.
- Handling and returns. Faulty, damaged or incorrect items are covered by our Returns and Replacements Policy. Opened vials cannot be returned for change of mind, for hygiene reasons. See the Returns and Replacements Policy for the full terms.
Completing your purchase confirms that you have read and accepted these terms in full.
Frequently asked questions
What are laboratory research materials?
Laboratory research materials are synthetic or naturally-derived molecules used in scientific and laboratory studies to explore biological pathways, mechanisms of action, and other experimental endpoints. These products are not approved for human consumption or medical use and are supplied strictly for in-vitro research.
What payment methods do you accept?
Ordering is not open yet, so no payment is taken and no order can be placed. Accepted payment methods, invoice terms for approved accounts and the billing descriptor that will appear on your statement are published here before ordering opens.
Are your laboratory research materials tested for quality?
Yes. Every compound we list has a certificate of analysis from Horizon Analytical, a laboratory in the USA. It reports identity, quantity and purity by UPLC/MS (ultra high performance liquid chromatography with mass spectrometry) and names the lot tested and the analysis date.
A purity figure describes the sample that was tested, on the stated date. It does not describe stability over time, storage history before the material reached us, or sterility. Sterility is not tested and is not claimed.
Do your laboratory research materials come with Certificates of Analysis (CoA)?
Yes. The certificate of analysis for each compound is linked on its product page under Lab reports, and every certificate is listed on the Lab results page. Each one names the lot tested, the analysis date and the results. Our own lot records are published under Verify a lot as lots are released, and can be looked up by the lot number on the vial.
