Research library

Guides for UK peptide researchers

24 in-depth articles, 32k words, on buying, legality, purity testing and the compounds we stock. No hype, no dosing advice.

Featured · Buying Guides

Buy Research Peptides UK: The 2026 Buyer's Guide

A plain-English guide to buying research peptides in the UK: what the law says, how to check a supplier and a COA, pens versus vials, and what a fair price looks like in 2026.

8 min read11 Sept 2026Read article

Purity & Testing

Counterfeit Peptides in the UK: MHRA Raids and How to Spot a Fake

The MHRA seized nearly 20 million doses of illegal medicines in 2025 and dismantled the first illicit pen factories found in the UK. What those cases revealed, and a checklist for spotting a fake before you buy.

9 min30 Sept 2026

GLP & Metabolic

Cagrilintide UK: The Amylin Analogue Behind CagriSema

Cagrilintide is the long-acting amylin analogue Novo Nordisk pairs with semaglutide in CagriSema. How amylin differs from GLP-1, what the trials reported, and what UK labs should check before buying.

8 min30 Sept 2026

GLP & Metabolic

GLP-1 Side Effects: What the Retatrutide and Tirzepatide Trials Reported

A trial-by-trial look at the adverse events reported for retatrutide, tirzepatide and semaglutide in their pivotal studies, and how the amylin analogues compare. Written for UK researchers, not as medical advice.

9 min30 Sept 2026

Buying Guides

How Much Do Research Peptides Cost in the UK? (2026 Prices)

What research peptides cost in the UK in 2026, using real pen prices: how to compare on price per milligram, what independent purity testing adds, and why the cheapest listing is rarely the best value.

9 min30 Sept 2026

Compound Profiles

PT-141 vs Melanotan II: What Melanocortin Research Shows

PT-141 and Melanotan II are near-identical melanocortin peptides with very different histories: one became a licensed US medicine, the other drew formal MHRA warnings. Here is what the research separates.

9 min30 Sept 2026

GLP & Metabolic

AOD 9604: The hGH Fragment Studied for Fat Metabolism

AOD 9604 is a modified fragment of human growth hormone developed in Australia as an anti-obesity drug, tested in mice and in over 900 trial participants, then shelved. What the research showed and its UK status.

8 min30 Sept 2026

Compound Profiles

Kisspeptin-10: The Reproductive Hormone Signal Explained

Kisspeptin-10 is the shortest fully active fragment of the peptide that switches on the reproductive axis. What the human infusion studies show, how it compares with kisspeptin-54, and what UK labs should check.

9 min30 Sept 2026

Compound Profiles

IGF-1 LR3: Long-Acting Growth Factor in Muscle Research

A plain-English profile of IGF-1 LR3, the 83-amino-acid IGF-1 analogue engineered in Adelaide in the 1990s: why it escapes binding proteins, what animal and cell research shows, and what UK labs should check.

8 min30 Sept 2026

Compound Profiles

Epitalon and Telomerase: What Longevity Research Actually Says

A sober look at epitalon, the Khavinson pineal tetrapeptide: the telomerase findings in human fibroblasts, the mouse lifespan data, the disputed human cohort, and what UK labs should check before buying.

8 min30 Sept 2026

Compound Profiles

Cartalax and ARA 290: Joint and Nerve Research Peptides

Two peptides often bought together: Cartalax, a Khavinson cartilage tripeptide with mostly cell-culture evidence, and ARA 290 (cibinetide), an EPO-derived peptide that reached phase 2 trials in small-fibre neuropathy.

9 min30 Sept 2026

GLP & Metabolic

Retatrutide UK: Research, Legal Status & Where It Stands in 2026

Retatrutide is the GIP, GLP-1 and glucagon triple agonist behind the largest weight-loss figures ever reported in a phase 3 trial. Here is where the research, and UK law, stand in 2026.

9 min11 Sept 2026

UK Legal & Compliance

Are Peptides Legal in the UK? MHRA Rules Explained

Research peptides are legal to buy, sell and possess in the UK, but the Human Medicines Regulations 2012 draw a hard line at human use. Here is exactly where that line sits.

8 min11 Sept 2026

GLP & Metabolic

Retatrutide vs Tirzepatide: What the Research Shows

Triple agonist against dual agonist. We compare retatrutide and tirzepatide on mechanism, published trial data, reported tolerability and where each stands with the MHRA in 2026.

8 min11 Sept 2026

Compound Profiles

BPC-157 and TB-500: The 'Wolverine' Blend Explained

The Wolverine blend pairs BPC-157, a gastric pentadecapeptide, with TB-500, a fragment of thymosin beta-4. Here is what the animal literature shows, where human evidence stands, and the UK legal position.

9 min11 Sept 2026

Compound Profiles

GHK-Cu Copper Peptide: Research Overview & UK Guide

A plain-English overview of GHK-Cu, the copper-binding tripeptide first isolated by Loren Pickart in 1973: what the research actually shows, how it is studied, and what UK labs should check before buying.

8 min11 Sept 2026

Buying Guides

Pre-Filled Peptide Pens vs Vials: Which Is Right for Your Lab?

Pre-filled peptide pens and lyophilised vials both have a place in the lab. This guide compares handling, stability, cost per milligram and UK legal status so you can pick the right format.

8 min11 Sept 2026

Purity & Testing

How to Read a Peptide Certificate of Analysis (Janoshik Explained)

A peptide certificate of analysis tells you what is in the vial or pen and how much of it is the peptide named on the label. Here is how to read every section of a Janoshik COA, and how to verify it.

9 min11 Sept 2026

Compound Profiles

Mitochondrial Peptides: MOTS-c, NAD+ and SS-31 Compared

Three compounds dominate mitochondrial research: MOTS-c, NAD+ and SS-31. This guide compares how each works, what trials and animal studies have shown, and what UK labs should know before buying.

9 min11 Sept 2026

Compound Profiles

CJC-1295, Ipamorelin & Tesamorelin: GH Secretagogues Explained

Growth hormone secretagogues are among the most-searched research peptides in the UK. This guide explains how CJC-1295, ipamorelin and tesamorelin differ, what the trials show and where they stand legally.

9 min11 Sept 2026

Compound Profiles

Selank and Semax: Nootropic Peptides in Research

Selank and Semax are two Russian-developed heptapeptides studied for anxiolytic and cognitive effects. This guide covers their mechanisms, the published evidence and their legal status for UK laboratories.

8 min11 Sept 2026

Purity & Testing

What Does 99% Purity Actually Mean? HPLC, Mass Spec & Endotoxins

A purity figure of 99% is everywhere in the research peptide market, but few buyers know what it measures or what it leaves out. This guide explains HPLC purity, mass-spec identity and endotoxin testing in plain English.

9 min11 Sept 2026

Buying Guides

How to Store Peptide Pens: Temperature, Light & Shelf Life

Peptide pens hold the peptide in solution, so storage decides how long the batch stays within specification. Here is the temperature, light and shelf-life guidance UK labs should follow.

8 min11 Sept 2026

GLP & Metabolic

Eloralintide: The Amylin Analogue Entering the Weight-Management Race

Eloralintide is a once-weekly selective amylin receptor agonist that produced up to 20.1% weight reduction in a 48-week phase 2 trial. Here is what the research says and where it stands in the UK.

8 min11 Sept 2026