PT-141 (Bremelanotide): Melanocortin Receptor Research Overview

PT-141, known generically as bremelanotide, is a synthetic cyclic heptapeptide that acts on melanocortin receptors. It is a close relative of Melanotan II and has been studied as a tool for understanding central melanocortin signalling. This overview covers what it is, where it came from, and what the published literature does and does not establish.

What It Is

Bremelanotide is a cyclic peptide analogue of alpha-melanocyte-stimulating hormone (alpha-MSH). It is described in the literature as a deamidated metabolite of Melanotan II, meaning it has the same core ring structure without a terminal amide group. It is typically supplied as a lyophilised powder, and our PT-141 10mg listing gives the specification.

Origins

Melanotan II was originally developed as a tanning-related melanocortin agonist. During early clinical work, investigators noted effects that were unrelated to pigmentation, and that observation led to the development of a more targeted analogue. For the earlier compounds, see Melanotan I and II research.

Receptor Targets

The melanocortin system has five receptor subtypes, MC1R to MC5R, each linked to different physiology.

PT-141 is described as an agonist at MC3R and MC4R with activity at other subtypes. Its profile differs from Melanotan II, which has broader activity including strong MC1R effects. Receptor selectivity is the main reason the two compounds are treated as separate research tools.

What Has Been Published

• •Preclinical work has examined melanocortin signalling in central pathways in rodents.
• •Clinical development led to a registered product in the United States, with a labelled indication and a documented adverse event profile. That regulatory history is specific to that product and jurisdiction, and it does not apply to research-grade material.

For a general comparison of how a compound moves from preclinical work to approval, see peptide hype vs peptide science.

Regulation in Australia

PT-141 is a therapeutic substance, and scheduling attaches to the substance rather than to any "research" label. Verify its current status against the Poisons Standard before purchase. See are research peptides legal in Australia.

Quality and Handling

As with any synthetic peptide, identity and purity should be confirmed by batch-specific HPLC and mass spectrometry. See how to read a peptide COA and the peptide storage guide.

Frequently Asked Questions

Is PT-141 the same as Melanotan II?

No. They are related, but PT-141 is a different molecule with a different receptor profile.

What is the difference between PT-141 and bremelanotide?

None. PT-141 is the research designation and bremelanotide is the generic name.

What does "P141" mean in searches?

It is a common misspelling of PT-141.

Disclaimer: All compounds referenced are supplied for in-vitro laboratory research only and are not for human or veterinary use. This article is educational and is not medical advice. Our PT-141 listing is a preorder and ships with the first batch.