# Research Peptide Index > A directory of research peptide identities. Each record lists the name, aliases, category, and the sequence or registry facts that were checked. Empty fields were not verified. This site is not a store and does not give dosing or handling instructions. The machine-readable pages are the public HTML records and the JSON-LD in each page head. The XML sitemap is https://researchpeptideindex.com/wp-sitemap.xml. ## Compounds - [AHK-Cu](https://researchpeptideindex.com/compounds/ahk-cu/): Alanyl-histidyl-lysine. The verified registry figures on this record are for the free tripeptide. Formula C15H26N6O4. PubChem CID 7408502. - [AOD 9604](https://researchpeptideindex.com/compounds/aod-9604/): Modified growth-hormone fragment indexed as AOD9604, PubChem CID 71300630. Formula C78H123N23O23S2. PubChem CID 71300630. - [ARA-290](https://researchpeptideindex.com/compounds/ara-290/): Cibinetide, the 11-residue peptide returned by PubChem for that name. Formula C51H84N16O21. PubChem CID 91810664. - [BPC-157](https://researchpeptideindex.com/compounds/bpc-157/): Synthetic 15-residue peptide fragment recorded in PubChem as CID 9941957. Formula C62H98N16O22. PubChem CID 9941957. - [Cagrilintide](https://researchpeptideindex.com/compounds/cagrilintide/): Acylated amylin analogue. PubChem CID 171397054. Formula C194H312N54O59S2. PubChem CID 171397054. - [Cartalax](https://researchpeptideindex.com/compounds/cartalax/): Tripeptide Ala-Glu-Asp. The formula matches PubChem CID 87815447. Formula C12H19N3O8. PubChem CID 87815447. - [CJC-1295](https://researchpeptideindex.com/compounds/cjc-1295/): The compound PubChem returns for the name CJC-1295, CID 91971820. Formula C165H269N47O46. PubChem CID 91971820. - [CJC-1295 without DAC](https://researchpeptideindex.com/compounds/cjc-1295-no-dac/): Modified GRF analogue. Formula and mass from PubChem CID 91976842. Formula C152H252N44O42. PubChem CID 91976842. - [DSIP](https://researchpeptideindex.com/compounds/dsip/): Delta sleep-inducing peptide, nonapeptide WAGGDASGE. PubChem CID 68816. Formula C35H48N10O15. PubChem CID 68816. - [Epitalon](https://researchpeptideindex.com/compounds/epitalon/): Tetrapeptide Ala-Glu-Asp-Gly, also called epithalon. PubChem CID 219042. Formula C14H22N4O9. PubChem CID 219042. - [GHK-Cu](https://researchpeptideindex.com/compounds/ghk-cu/): Copper complex of the glycyl-histidyl-lysine tripeptide. Formula C14H23CuN6O4+. PubChem CID 71587328. - [GHRP-2](https://researchpeptideindex.com/compounds/ghrp-2/): Growth hormone-releasing peptide 2, indexed in PubChem as pralmorelin. Formula C45H55N9O6. PubChem CID 6918245. - [GHRP-6](https://researchpeptideindex.com/compounds/ghrp-6/): Growth hormone-releasing peptide 6, PubChem CID 4345065. Formula C46H56N12O6. PubChem CID 4345065. - [Hexarelin](https://researchpeptideindex.com/compounds/hexarelin/): Growth-hormone secretagogue, also called examorelin. PubChem CID 6918297. Formula C47H58N12O6. PubChem CID 6918297. - [IGF-1 LR3](https://researchpeptideindex.com/compounds/igf-1-lr3/): Research name for long R3 IGF-1. - [Ipamorelin](https://researchpeptideindex.com/compounds/ipamorelin/): Growth-hormone secretagogue with non-canonical residues, PubChem CID 9831659. Formula C38H49N9O5. PubChem CID 9831659. - [Kisspeptin-10](https://researchpeptideindex.com/compounds/kisspeptin-10/): C-terminal amide decapeptide of kisspeptin. The amide formula matches PubChem CID 25240297. Formula C63H83N17O14. PubChem CID 25240297. - [KPV](https://researchpeptideindex.com/compounds/kpv/): Lys-Pro-Val, the C-terminal tripeptide of alpha-MSH, PubChem CID 125672. Formula C16H30N4O4. PubChem CID 125672. - [LL-37](https://researchpeptideindex.com/compounds/ll-37/): 37-residue human cathelicidin peptide. The sequence matches PubChem CID 16198951. Formula C205H340N60O53. PubChem CID 16198951. - [Melanotan I](https://researchpeptideindex.com/compounds/melanotan-i/): Afamelanotide, a linear alpha-MSH analogue. PubChem CID 16197727. Formula C78H111N21O19. PubChem CID 16197727. - [Melanotan II](https://researchpeptideindex.com/compounds/melanotan-ii/): Cyclic melanocortin peptide, PubChem CID 92432. Not the same record as bremelanotide. Formula C50H69N15O9. PubChem CID 92432. - [MOTS-c](https://researchpeptideindex.com/compounds/mots-c/): 16-residue mitochondrial open reading frame peptide, PubChem CID 146675088. Formula C101H152N28O22S2. PubChem CID 146675088. - [Oxytocin](https://researchpeptideindex.com/compounds/oxytocin/): Cyclic nonapeptide hormone. Free-base identity PubChem CID 439302, CAS 50-56-6. Formula C43H66N12O12S2. PubChem CID 439302. - [PE-22-28](https://researchpeptideindex.com/compounds/pe-22-28/): Research name. No registry record is attached. - [Pinealon](https://researchpeptideindex.com/compounds/pinealon/): Tripeptide Glu-Asp-Arg. The formula matches PubChem CID 10273502. Formula C15H26N6O8. PubChem CID 10273502. - [PT-141](https://researchpeptideindex.com/compounds/pt-141/): Bremelanotide, a cyclic melanocortin peptide. PubChem CID 9941379. Formula C50H68N14O10. PubChem CID 9941379. - [Selank](https://researchpeptideindex.com/compounds/selank/): Heptapeptide TKPRPGP. The formula matches PubChem CID 11765600. Formula C33H57N11O9. PubChem CID 11765600. - [Semax](https://researchpeptideindex.com/compounds/semax/): Heptapeptide MEHFPGP. The formula matches PubChem CID 9811102. Formula C37H51N9O10S. PubChem CID 9811102. - [Sermorelin](https://researchpeptideindex.com/compounds/sermorelin/): 29-residue GHRH analogue amide. The sequence matches PubChem CID 16132413. Formula C149H246N44O42S. PubChem CID 16132413. - [SNAP-8](https://researchpeptideindex.com/compounds/snap-8/): Acetyl octapeptide-3. The capped sequence matches PubChem CID 76283482. Formula C41H70N16O16S. PubChem CID 76283482. - [SS-31](https://researchpeptideindex.com/compounds/ss-31/): Elamipretide, a mitochondria-targeted tetrapeptide with non-canonical residues. Formula C32H49N9O5. PubChem CID 11764719. - [TB-500](https://researchpeptideindex.com/compounds/tb-500/): Catalog name stored here against the 43-residue thymosin beta-4 record, with the fragment naming problem made explicit. Formula C212H350N56O78S. PubChem CID 45382195. - [Tesamorelin](https://researchpeptideindex.com/compounds/tesamorelin/): Synthetic GHRH analogue with a verified PubChem record and an N-terminal modification. Formula C221H366N72O67S. PubChem CID 16137828. - [Thymosin Alpha-1](https://researchpeptideindex.com/compounds/thymosin-alpha-1/): 28-residue acetylated peptide (thymalfasin). The formula matches PubChem CID 16130571. Formula C129H215N33O55. PubChem CID 16130571. - [VIP](https://researchpeptideindex.com/compounds/vip/): 28-residue vasoactive intestinal peptide. Formula and mass from PubChem CID 53314964. Formula C147H237N43O43S. PubChem CID 53314964. ## Categories - [Copper peptides](https://researchpeptideindex.com/categories/copper-peptides/): Short peptides indexed as copper complexes or as the free peptide behind a copper-complex name. - [Cosmetic peptide research](https://researchpeptideindex.com/categories/cosmetic-peptide-research/): Peptides that appear in cosmetic and pigmentation research names. - [Growth-hormone research](https://researchpeptideindex.com/categories/growth-hormone-research/): GHRH analogues, ghrelin-receptor secretagogues, and related growth-hormone research names. - [Immune research](https://researchpeptideindex.com/categories/immune-research/): Peptides indexed from immune, host-defense, or thymic research. - [Metabolic research](https://researchpeptideindex.com/categories/metabolic-research/): Compounds indexed for metabolic, endocrine, or body-composition research. The category is a browsing group, not a result. - [Mitochondrial research](https://researchpeptideindex.com/categories/mitochondrial-research/): Compounds discussed in mitochondrial research, including mitochondrial peptides and mitochondria-targeted sequences. - [Neurological research](https://researchpeptideindex.com/categories/neurological-research/): Neuropeptides and other compounds indexed from neurological or neuroendocrine research names. - [Senescence research](https://researchpeptideindex.com/categories/senescence-research/): Compounds indexed from cellular-senescence research names. - [Tissue research](https://researchpeptideindex.com/categories/tissue-research/): Peptides indexed from tissue, repair, or extracellular-matrix research names. ## The index - [About the Index](https://researchpeptideindex.com/about/): What a Research Peptide Index record is, who it is for, and what the site does not do. - [Corrections](https://researchpeptideindex.com/corrections/): Report a wrong sequence, alias, category, or citation. - [Methodology](https://researchpeptideindex.com/methodology/): How Research Peptide Index matches names to registry records, which sources it uses, the rule for each field, what “Not verified” means, and how research status is assigned. - [References](https://researchpeptideindex.com/references/): How Research Peptide Index cites PubChem, UniProt, and other public records, how to cite a record, and the full source index for every compound. - [Research categories](https://researchpeptideindex.com/research-categories/): Nine browsable groups. A compound can belong to more than one. - [Sponsorship](https://researchpeptideindex.com/sponsorship/): NuLife Peptides supports Research Peptide Index. The index is not a store and not a ranking.