PT-141 vs Melanotan II
PT-141 is a cyclic heptapeptide alpha-MSH analog (MC3R/MC4R agonist). Melanotan II is a cyclic heptapeptide melanocortin (α-MSH) analog. They are different materials with different identities and different research literatures; the table below sets the two identities side by side, the sections after it summarise what each is studied for, and the certificate rows show how each has tested.
PT-141 and Melanotan II side by side
| Field | PT-141 | Melanotan II |
|---|---|---|
| Catalogue name | PT-141 | Melanotan II |
| Type | Single peptide | Single peptide |
| Class | Cyclic heptapeptide alpha-MSH analog (MC3R/MC4R agonist) | Cyclic heptapeptide melanocortin (α-MSH) analog |
| Components | Single compound | Single compound |
| Molecular formula | C50H68N14O10 | C50H69N15O9 |
| Molecular weight | 1025.18 Da | 1024.18 Da |
| Sequence length | 7 residues | 7 residues |
| CAS or identifier | Bremelanotide | Melanotan II (MTII) |
| Form supplied | Lyophilized powder | Lyophilized powder |
| Sizes | 10mg | 10mg |
| Price from | $45 | $45 |
| Documented HPLC results | 5 (99.91 to 99.95%) | 3 (99.36 to 99.93%) |
| Testing laboratories | Accurate Test Labs, Freedom Diagnostics | Accurate Test Labs, Freedom Diagnostics |
Identity fields come from the catalogue entry for each compound. Certificate counts are documented third-party HPLC results with a published certificate; image-only documents are excluded from the counts.
What the research literature describes
PT-141
- Melanocortin-4 Receptor Activation MC4R Agonism
- Hypothalamic Signaling Modulation Central Pathways
- Cyclic MSH Derivative Alpha-MSH Analog
Melanotan II
- MC1R Signalling & Melanogenesis MC1R Agonism
- Central MC3R / MC4R Pathways MC4R Agonism
- Non-Selective Pan-MC Agonism Receptor Selectivity
What each is studied for
PT-141
- Central Arousal Models Melanocortin Signalling
- Melanocortin System Receptor Pharmacology
- MC4R Pathway Models Sexual Function Models
- CNS Mechanism Studies Neuropharmacology
Melanotan II
- Melanogenesis Research Pigmentation
- Melanocortin Energy Balance Energy Balance
- Arousal Pathway Models MC4R Signalling
- Melanocortin System Probing Receptor Pharmacology
Headings name the mechanisms and research applications described for each compound; the full text of each sits on the compound monograph linked below. They summarise findings reported in preclinical models. They describe what has been studied, not outcomes in people or animals outside the laboratory.
Catalogue, monographs and certificates
- PT-141 in the catalogueSizes, price and current certificate
- PT-141 monographMolecular data and mechanisms studied
- PT-141 lab resultsEvery third-party certificate
- Melanotan II in the catalogueSizes, price and current certificate
- Melanotan II monographMolecular data and mechanisms studied
- Melanotan II lab resultsEvery third-party certificate
- All comparisonsEvery pair in the library
What is the difference between PT-141 and Melanotan II?
PT-141 is a cyclic heptapeptide alpha-MSH analog (MC3R/MC4R agonist); Melanotan II is a cyclic heptapeptide melanocortin (α-MSH) analog. PT-141 has 7 residues and Melanotan II has 7. Their molecular identities, the models they have been studied in and their certificate records are all listed on this page.
Are PT-141 and Melanotan II sold together?
No. Eon Peptides lists them as separate catalogue items, each with its own sizes and its own certificates.
How has each tested?
PT-141: 5 documented third-party HPLC results from 99.91% to 99.95%. Melanotan II: 3 documented results from 99.36% to 99.93%. Every certificate is published and linked from each compound's lab results page.
Which one should a research project use?
That depends on the pathway and model under study, which is a scientific question this page does not answer. What it does is put the identities, the described mechanisms and the analytical records side by side so the choice can be made on documented facts. Both materials are for laboratory research use only.
For research use only. Not for human or veterinary use. Nothing on this page describes or recommends use in people or animals.