How to Choose a UK Research Peptide Supplier

Choosing a research peptide supplier in the UK comes down to evidence you can check before you order. A strong supplier tells you what the compound is, how pure it is and by which method, who tested it and for whom, which company you are buying from, when your order will leave and arrive, and what each milligram costs. Every one of those points can be verified from the supplier's own pages and documents.

This guide sets out seven checks, explains what each one tells you and why it matters for laboratory work, and shows how British Peptide Labs meets each of them. It is a procurement checklist built on chemistry and documentation.

The seven checks at a glance

The sections below take each check in turn.

1. HPLC purity, with the method stated

Purity is the first figure most buyers look for, and it means most when it comes with its method. For synthetic peptides the standard is reversed-phase HPLC with ultraviolet detection, usually at 210 to 220 nm, where the peptide bonds absorb. The result is the main peak's share of the total peak area: a figure of ≥99% says that at least 99% of the UV-absorbing material in the sample elutes as the target peptide.

When you compare suppliers, check that the figure is a stated value, that it names HPLC as the method, and that a certificate backs it with a chromatogram, a detection wavelength and an analysis date. HPLC purity is also a different quantity from net peptide content, which measures how much of the powder's weight is peptide once counter-ions and water are accounted for; peptide purity vs net peptide content explains the difference.

How we meet it. Every research compound we supply is ≥99% purity (HPLC), and the figure appears on each product page alongside the compound's identifiers. Our quality and specifications page sets out what each product page documents. HPLC and peptide purity explains how the figure is measured.

2. LC-MS identity

Purity tells you how much of the sample is one compound; identity tells you which compound it is. The standard method is liquid chromatography–mass spectrometry, LC-MS, which measures the molecular mass of the material in the main peak and compares it with the mass expected from the molecular formula. For a short peptide the match is read from a few singly and doubly charged ions; for a long one, from a deconvoluted series of multiply charged ions.

A good identity result states both numbers, expected and observed, so you can see how closely they agree. It is the most direct check that the vial contains the sequence on the label, including details such as a C-terminal amide or an N-terminal acetyl group that change the mass by a precise amount. Mass spectrometry and peptide identity covers how the comparison is made.

How we meet it. Our compounds are tested by HPLC and LC-MS together, so each report gives purity and identity side by side. Each product page lists the identifiers the mass is checked against: CAS number, molecular formula, molecular weight and, for sequenced peptides, the sequence. Our BPC-157 page is a good example, with the fifteen-residue sequence written out in full.

3. Independent third-party testing

Who did the testing matters as much as what the test found. An independent third-party testing service has no stake in the result, and its report is a separate source of evidence from the supplier's own description of the product. Look for the testing service's name on the report and for a report reference you can quote back to it.

How we meet it. Our compounds undergo independent third-party testing by PeptideVerify, the testing service of Verify Analytik Ltd, which analyses each compound by HPLC and LC-MS and issues its reports to British Peptide Labs. The reports are published in our COA Library and on the product page, so you can read them before you order.

4. Certificates issued to the supplier, tied to a batch

A certificate of analysis documents a specific sample, submitted by a specific client, analysed on a specific date. Three details turn it into useful evidence: the client named on the report is the company selling to you, the report carries a reference and an issue date, and the product and batch on the report match what you receive. A certificate issued to a different company describes that company's material.

When you read a certificate, also check that the product is identified by name and salt form, that every result states its method, and that the testing service is named. How to read a peptide certificate of analysis walks through a report field by field.

How we meet it. The reports in our COA Library are prepared for British Peptide Labs, and each names the issuing testing service, the report number and issue date, the methods used and the results. For the batch you receive, email us your order number, using the address shown in the COA Library, and we send the batch certificate for your order.

5. UK dispatch and tracked delivery

For laboratory work, knowing when material will arrive is part of planning an experiment. A strong UK supplier states a dispatch cut-off, names its carrier and tracked service, and shows the delivery charge before checkout, so there are no surprises at the end of the order.

Lyophilised peptides travel well as sealed solids, and a short, tracked journey keeps transit time to a minimum. On arrival, sealed vials go straight into cold storage; storing lyophilised peptides explains why cold, dark and dry storage matters for a freeze-dried solid.

How we meet it. Orders placed before 3pm Monday to Saturday are packed the same working day and handed to Royal Mail Tracked 24, for next-day tracked delivery. UK delivery is free, and you receive tracking from dispatch. The full terms are on our shipping page.

6. A registered UK company

The company behind a store should be identifiable in public records. In the UK that means a company name and number on the Companies House register, which anyone can search free of charge. The register shows the registered office, the date of incorporation and the company's filing history. A supplier that states its legal entity, company number and registered address on its own site makes this check a matter of seconds.

How we meet it. British Peptide Labs is the trading name of AODAEMON LTD, a company registered in England and Wales under company number 17176945, with its office in London. The company name and number appear on our site, and the number can be checked on the Companies House register in seconds.

7. Transparent per-mg pricing

Vial sizes vary between suppliers, so headline prices are hard to compare directly. The fair basis is pounds per milligram of net peptide: the vial price divided by the vial's net content. Compare like with like, meaning the same compound, the same purity basis and, where possible, a similar vial size, since larger vials often carry a lower cost per mg.

A supplier that shows the per-mg figure itself saves you the arithmetic and makes its pricing easy to benchmark. A published market view helps too: it shows whether a price sits near the middle of the UK market or at either end.

How we meet it. Each product page shows the cost per mg for every presentation, next to the vial price. For the wider market, our UK Peptide Price Index is a monthly snapshot of the public list prices UK research peptide suppliers charge, expressed in pounds per milligram, with the median, lowest and highest £/mg for each compound and a free CSV of the data. Our GHK-Cu and NAD+ pages show how the per-mg figure sits beside each vial size.

Putting the checks together

The seven checks reinforce each other. A purity figure means most when the method is named, the identity result confirms the compound, an independent testing service stands behind both, and the certificate is issued to the company you are buying from. Clear dispatch terms, a registered company and transparent per-mg prices then cover the commercial side of the order.

A practical way to apply them is to open three pages for any supplier you are considering: a product page, the certificate library and the company or about page. Within a few minutes you can see the identifiers, the purity basis, the testing service, the client named on the reports, the company number, the dispatch cut-off and the price per milligram.

Where to start with us. Browse the full catalogue on our products page, where each compound links to its identifiers, purity and price per mg. Read the reports in the COA Library, see how we document each compound on the quality page, and benchmark our prices against the market in the UK Peptide Price Index. For compound-level chemistry, the Learn hub covers individual molecules such as ipamorelin in depth, from sequence to analytical profile.

Terms used on this page, such as HPLC purity, net peptide content and certificate of analysis, are defined in the glossary.