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Melanocortin Research Peptides for Sale UK | Melanocortin Research Overview

This collection groups research-grade melanocortin-receptor peptides for preclinical and in-vitro laboratory research. Melanotan 2 and PT-141 are two of the most extensively studied melanocortin-receptor ligands in the published preclinical literature. Both originate from the University of Arizona melanocortin research programme initiated in the 1980s. Both are supplied here as research-grade freeze-dried vials, manufactured to ≥98% HPLC purity, identity-confirmed by mass spectrometry, and shipped with a batch-specific certificate of analysis.

Cyclic peptides such as these require confirmation of stereochemistry — not just HPLC purity — because racemisation during synthesis or storage can produce mirror-image variants that behave as antagonists rather than agonists at melanocortin receptors. Every batch is mass-spectrometry verified before dispatch.

Sold for research use only. Not for human consumption. Not for cosmetic, therapeutic, or self-administration use.

What Are Melanocortin Research Peptides?

Melanocortin peptides are a class of research compounds that bind to the melanocortin receptor family (MC1R through MC5R) — a group of G-protein-coupled receptors expressed on melanocytes, in the central nervous system, in adipose tissue and elsewhere. In preclinical research, melanocortin-receptor ligands are used as pharmacological tools to probe receptor pharmacology, receptor signalling and receptor selectivity across the family.

The compounds in this collection are synthetic analogues of alpha-MSH (alpha-melanocyte-stimulating hormone), the body's endogenous melanocortin ligand. In animal models and cell-culture studies, these analogues have been used to probe receptor activation independent of the physiological triggering stimulus (ultraviolet radiation in the case of the MC1R receptor). The core research question that generated this compound class in the 1980s — whether receptor activation can be probed pharmacologically without the physiological trigger — remains a foundation of published melanocortin receptor research.

Melanotan 2 — Research Overview

Melanotan 2 (MT-II) is a synthetic cyclic heptapeptide analogue of alpha-MSH developed during the University of Arizona melanocortin programme in the 1980s. In the published preclinical literature, MT-II is characterised as a non-selective agonist across multiple melanocortin receptors (MC1R, MC3R, MC4R, MC5R), which makes it a widely used pharmacological tool for probing melanocortin-receptor pharmacology in animal models and cell-culture systems.

The compound's cyclic (ring-shaped) structure is central to its receptor-binding profile. The cyclic conformation confers greater resistance to enzymatic degradation than linear alpha-MSH, but it also introduces a stereochemistry-verification requirement: cyclic peptides can undergo racemisation during synthesis or storage, producing mirror-image variants that behave as receptor antagonists rather than agonists. For this reason, structural confirmation by mass spectrometry is a critical quality-control step for MT-II research material — not just HPLC-based purity measurement.

• Non-selective melanocortin-receptor agonist — activates MC1R, MC3R, MC4R and MC5R in published receptor-binding studies; used as a reference compound in receptor-selectivity research.
• MC1R pathway research — studied in cell-culture melanocyte models for effects on melanogenesis pathway signalling independent of UV stimulation.
• MC3R and MC4R pathway research — studied in animal models for effects on central-nervous-system melanocortin signalling and energy-homeostasis pathway research.
• Melanoma cell-biology research tool — used in oncology research programmes to probe melanocortin-receptor signalling in melanoma-derived cell lines.
• 30+ years of published preclinical literature — original Arizona-programme publications remain cited in current melanocortin research.
• Structure confirmed by mass spectrometry on every batch — critical for cyclic peptides where racemisation would produce receptor-antagonist contaminants.

View Melanotan 2 — 10mg Research Vial, ≥98% HPLC Purity, COA Included →

PT-141 (Bremelanotide) — Research Overview

PT-141 (Bremelanotide) is a melanocortin-receptor agonist derived from the same University of Arizona research programme as Melanotan 2. Compared with MT-II, PT-141 has a modified receptor-selectivity profile that has been characterised across the melanocortin receptor family in published binding studies.

PT-141 has the most complete clinical-trial dataset of any compound in the melanocortin research class. In 2019, the compound (branded Bremelanotide/Vyleesi) received FDA approval following full Phase III clinical trials, making the clinical pharmacokinetic and safety data publicly available in the regulatory record. For preclinical researchers, this makes PT-141 a valuable reference standard when comparing receptor-pharmacology findings from animal models against a compound with published human pharmacokinetic data.

• Melanocortin-receptor agonist with published Phase III trial data — the only melanocortin compound in this collection with FDA-record pharmacokinetic and safety data available.
• Receptor-selectivity research reference — modified selectivity profile relative to MT-II; used in comparative receptor-pharmacology designs in animal models.
• Cardiovascular pathway research — cardiovascular observations from the clinical trial dataset provide reference data for preclinical cardiovascular researchers examining melanocortin-receptor mechanisms.
• Central-nervous-system melanocortin research — studied in animal models for effects on central-nervous-system melanocortin signalling pathways that operate independently of peripheral vasoactive mechanisms.
• Most clinically characterised melanocortin compound available — full Phase III trial data provides a reference dataset unavailable for other compounds in this research class.

View PT-141 (Bremelanotide) — 10mg Research Vial, COA Included →

Quality Control for Cyclic Melanocortin Research Peptides

Cyclic peptides — including Melanotan 2 and, structurally, PT-141 — carry a specific quality-control requirement not shared by linear peptides. During synthesis and storage, cyclic peptides can undergo racemisation, in which stereocentres flip to produce mirror-image variants. Mirror-image cyclic peptides bind to the same receptor site but often act as antagonists rather than agonists — producing receptor-blocking rather than receptor-activating effects in preclinical assays.

HPLC-based purity testing measures how much of a sample matches the target retention time — but it cannot reliably distinguish the correct stereoisomer from its mirror image. Confirmation of the correct stereochemistry requires mass spectrometry combined with correct-configuration assignment. Every batch in this collection is verified by mass spectrometry before dispatch, with the certificate of analysis available via the QR code on every research vial.

Common Research Questions

• What is Melanotan 2 used for in research? — MT-II is used as a non-selective melanocortin-receptor agonist reference compound in preclinical receptor-pharmacology, melanogenesis-pathway signalling, and MC3R/MC4R/MC5R pathway studies in animal and cell-culture models.
• What is PT-141 used for in research? — PT-141 (Bremelanotide) is used as a clinically characterised melanocortin-receptor reference compound in preclinical designs that benefit from published Phase III pharmacokinetic and safety data.
• What receptors do these compounds target? — the melanocortin receptor family (MC1R, MC3R, MC4R, MC5R), G-protein-coupled receptors expressed on melanocytes, in the central nervous system, in adipose tissue and elsewhere.
• Why is mass-spectrometry testing critical for cyclic peptides? — because racemisation can produce mirror-image receptor antagonists that HPLC alone cannot distinguish from the correct stereoisomer.
• Are these compounds legal to sell in the UK? — as research chemicals for in-vitro and preclinical laboratory research, yes. They are not authorised as medicines or cosmetics in the UK, and are not supplied for human use.

Why Buy Research Peptides from Pure Grade Labs

• ✓  ≥98% HPLC purity — independently tested before every dispatch
• ✓  Batch-specific certificate of analysis — QR code on every vial links to COA
• ✓  Structure confirmed by mass spectrometry — critical for cyclic peptides; confirms correct stereochemistry on every batch
• ✓  UK supply — domestic dispatch
• ✓  Bacteriostatic water available separately for laboratory reconstitution