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Research Use Only!
UK Buying Guide
Where to Buy PT-141 in the UK
PT-141 is closely related to Melanotan 2 in structure, which means substitution between the two is a real risk when documentation is absent. This guide covers what to verify and what is available.
Identity by mass spectrometryPurity by HPLCUK & EU deliverySealed on arrival
Overview
What Is PT-141?
PT-141 (bremelanotide) is a synthetic melanocortin receptor agonist and a metabolite-derived analogue structurally related to Melanotan 2. It is studied in melanocortin pathway research. Because the two compounds are structurally close, mass spectrometry identity confirmation is the check that distinguishes them. It is supplied as lyophilised powder in a sealed vial.
Classification
Synthetic melanocortin receptor agonist research peptide
Format supplied
vial
Structure
Cyclic heptapeptide melanocortin receptor agonist (bremelanotide)
Closest relative
Melanotan 2, from which it differs at the C-terminus
Purity specification
99%+ by HPLC, chromatogram and analysis date on the certificate
Research use only
Not a medicine. Not for human or veterinary consumption.
Available Options
PT-141 Options Available From Arma Peptides
PT-141 is supplied as a single lyophilised vial. Compare it against Melanotan 2 listings on identity data rather than price, because the two are routinely conflated.
Product
Format
Size
Price
Stock
Handling & Delivery
PT-141 Handling and UK Delivery
Handle PT-141 as you would Melanotan 2, with the same light and oxidation discipline.
Keep It Dark
Melanocortin peptides degrade under laboratory lighting. Vial stays in the carton; reconstituted solution stays wrapped or in an opaque container.
Gentle Dissolution
Add diluent down the wall and let it stand. Cyclic peptides do not benefit from agitation and foaming costs you material at the surface.
Aliquot Before Freezing
Single-use portions frozen at −20 °C, thawed once. Repeated cycling on a cyclic peptide is not worth the convenience.
Same-Day Tracked Dispatch
Before the daily cut-off, orders leave the same working day, tracked and plain-packaged, with fast UK & EU delivery from Arma Nova Pharma and 48-hour photographic damage cover.
Due Diligence
PT-141 and Melanotan 2 Share a Backbone — Confirm Which Is in the Vial
PT-141, bremelanotide, is a close structural relative of Melanotan 2. That relationship is the source of nearly every documentation problem on this compound.
- STEP 01
One Residue Apart in Practice
PT-141 is a metabolite-derived analogue of Melanotan 2 with a modified C-terminus. Because Melanotan 2 is cheaper and more widely stocked, substitution is the obvious commercial temptation, and only molecular weight exposes it.
- STEP 02
Also Cyclic, Also Needs Ring Confirmation
Like Melanotan 2, PT-141 is a cyclic peptide. Incomplete cyclisation leaves linear precursor behind, so the chromatogram needs to be read for shoulder peaks rather than skimmed for a headline figure.
- STEP 03
Selectivity Claims Require Identity Data
PT-141 is chosen over Melanotan 2 specifically for a different receptor profile. That property belongs to the exact structure, so purity data without identity confirmation cannot support the choice.
- STEP 04
A Single Listing Still Needs Full Paperwork
PT-141 is supplied here in one vial size, and it carries the same lot-matched chromatogram, mass-spec confirmation and independent laboratory analysis as the high-volume compounds.
Sold as a research reagent. Not a medicinal product, not for consumption by humans or animals, and not for use in diagnostic procedures.
FAQ
PT-141 in the UK: Questions Researchers Ask Before Ordering
+Can PT-141 be bought legally in the UK?
For laboratory research, yes. It is not an MHRA-licensed medicine in this form, cannot be marketed as one, and must not be used for human or veterinary consumption.
+How does PT-141 differ from Melanotan 2?
PT-141 (bremelanotide) is a C-terminally modified analogue of Melanotan 2 with a different melanocortin receptor profile. The structures are close, which is exactly why mass-spectrometry identity data matters when buying either.
+Is PT-141 also cyclic?
Yes. It is a cyclic heptapeptide, and residual linear precursor from incomplete ring closure is the impurity to look for on the chromatogram.
+How is PT-141 different from Melanotan 2?
PT-141 is structurally related but is a distinct compound with a different receptor profile in research models. Because they are close in structure, only mass spectrometry identity confirmation reliably distinguishes one from the other in a supplied vial.
+Why is PT-141 also called bremelanotide?
Bremelanotide is the compound’s formal non-proprietary name; PT-141 is the development code it is more commonly listed under in research catalogues. Both refer to the same molecule.
+What documentation ships with it?
A batch-specific COA with the lot number matching your vial, HPLC purity at a minimum of 99%, the chromatogram, the analysis date, the laboratory, and mass-spectrometry molecular-weight confirmation.
+How should PT-141 be stored?
Sealed and dark at 2–8 °C, or −20 °C for long-term holding. Once reconstituted, refrigerate, keep out of light and avoid repeated freeze–thaw.
+Can I return it unopened?
Yes, within 14 days of receipt while unopened and in original sealed packaging. Unsealed vials are excluded for health-protection reasons; faulty or misdescribed goods remain covered by statutory rights.
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