--- title: "Is PT-141 the same as bremelanotide? Research peptide names, codes and synonyms | Sable Peptides" description: "A cross-reference of research peptide names, non-proprietary names, development codes and cosmetic INCI names (PT-141, ARA-290, Matrixyl, SNAP-8, GHRP-2, retatrutide and more), each tied to a primary source." canonical: https://www.sablepeptides.co.uk/guides/research-peptide-names-codes-and-synonyms dateModified: 2026-10-16 publisher: Sable Peptides Limited (UK company 17488610) note: Research use only. Not for human or veterinary use. --- # 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)](https://pubmed.ncbi.nlm.nih.gov/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)](https://pubmed.ncbi.nlm.nih.gov/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)](https://pubmed.ncbi.nlm.nih.gov/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)](https://pubmed.ncbi.nlm.nih.gov/11457843/); [Afamelanotide, 2012 (PubMed 38598652)](https://pubmed.ncbi.nlm.nih.gov/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 - [Melanocortin peptides](/guides/melanocortin-peptides-alpha-msh-analogues) - [ARA-290](/guides/ara-290-epo-derived-helix-b-peptide) - [Matrixyl vs SNAP-8](/guides/matrixyl-vs-snap-8-signal-and-neurotransmitter-peptides) - [Glossary](/glossary) 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