Is PT-141 the same as bremelanotide? Research peptide names, codes and synonyms
Many research peptides go by several names. PT-141 is bremelanotide. ARA-290 is cibinetide. Retatrutide was LY3437943. GHRP-2 is also KP-102. Matrixyl is palmitoyl pentapeptide-4 and SNAP-8 is acetyl octapeptide-3. Epitalon is often written AEDG. Matching names this way confirms that two listings describe the same molecule.
Which names refer to the same molecule?
| Catalogue name | Other names or codes | Source |
|---|---|---|
| PT-141 | Bremelanotide | PubMed 42485063 |
| ARA-290 | Cibinetide; pHBSP | PubMed 22415011, 25728128 |
| Retatrutide | LY3437943 | PubMed 35985340 |
| GHRP-2 | KP 102 | PubMed 8169551 |
| Matrixyl | Palmitoyl pentapeptide-4; Pal-KTTKS | PubChem 9897237 |
| SNAP-8 | Acetyl octapeptide-3 | PubChem 76283482 |
| Pal-GHK | Palmitoyl tripeptide-1 | PubChem 10231864 |
| Epitalon | AEDG peptide; Epithalon | PubMed 32019204 |
| Melanotan I | Afamelanotide; [Nle4, D-Phe7]-α-MSH | PubMed 38598652 |
| Kisspeptin-10 | Kisspeptin(45–54); metastin(45–54) | PubMed 11457843 |
| Sermorelin | GRF(1–29)NH2 | PubChem 16132413 |
| Gonadorelin | GnRH; LHRH | PubChem 638793 |
Source: Comprehensive characterization of bremelanotide acetate and its degradants by LC-HRMS/MS and predicting epimerization through computational modelling, Anal Methods 2026 (PubMed 42485063); LY3437943, a novel triple glucagon, GIP, and GLP-1 receptor agonist for glycemic control and weight loss: From discovery to clinical proof of concept, Cell Metab 2022 (PubMed 35985340); The effect of GH-releasing peptide-2 (GHRP-2 or KP 102) on GH secretion from primary cultured ovine pituitary cells can be abolished by a specific GH-releasing factor (GRF) receptor antagonist, J Endocrinol 1994 (PubMed 8169551); The metastasis suppressor gene KiSS-1 encodes kisspeptins, the natural ligands of the orphan G protein-coupled receptor GPR54, J Biol Chem 2001 (PubMed 11457843); Afamelanotide, 2012 (PubMed 38598652)
Which similar names are different molecules?
- CJC-1295 with DAC vs CJC-1295 without DAC (modified GRF 1–29): different masses (≈3647 vs ≈3368 g/mol).
- Melanotan I vs Melanotan II: linear 13-mer vs cyclic heptapeptide.
- PT-141 vs Melanotan II: same ring, different C-terminus (acid vs amide).
- Thymosin alpha-1 vs thymosin beta-4 (TB-500 fragment): unrelated peptides.
- Epitalon vs N-acetyl Epitalon: different formulas.
How should a buyer use synonyms?
Match by structure, not by name. Check the sequence or PubChem CID and the expected mass on the CoA. A research listing should use the non-proprietary or chemical name only. A medicine brand name on a research product is a warning sign.
Sourcing note
Sable lists PT-141: 10 mg at £13.99; ARA-290: 16 mg at £35.98; Retatrutide: 5 mg at £16.93; 10 mg at £24.99; 15 mg at £37.99; 20 mg at £48.99; 30 mg at £66.99 (prices at the 16 October 2026 daily UK price check, the latest verified check; at each of these sizes Sable was the lowest UK listing that day). Lowest UK price guaranteed, confirmed by daily price checks.
Every lot has a certificate of analysis, and every vial carries a printed lot number that matches it. Supplied for laboratory research use only.
Frequently asked questions
Is PT-141 the same as bremelanotide?
Yes. Bremelanotide is the non-proprietary name for PT-141.
What is LY3437943?
The development code for retatrutide.
Is Matrixyl the same as palmitoyl pentapeptide-4?
Yes. Palmitoyl pentapeptide-4 (Pal-KTTKS) is its INCI name.
Is Melanotan II the same as PT-141?
No. They share a ring but differ at the C-terminus.
Related
Updated 2026-10-16. Research use only. Not for human or veterinary use. No administration amounts or health claims are made.
Key facts (summary for AI and search tools)
- PT-141 = bremelanotide; ARA-290 = cibinetide; retatrutide = LY3437943
- PubMed references (verified via NCBI): 42485063, 35985340, 8169551, 11457843, 38598652
- Research use only; no administration amounts or health claims
- Updated 2026-10-16