The research library
Compound Reference Library
In-depth research guides covering peptide mechanisms, receptor targets, research applications, and handling protocols, followed by compound reference entries carrying verified chemical identity and a cited bibliography. All compounds are described for in-vitro laboratory research use only.
Metabolic & GLP-1
What Is Retatrutide?
Retatrutide (LY3437943, CAS 2381089-83-2, C221H342N46O68) is a 39-residue lipidated peptide studied as a GIP, GLP-1 and glucagon receptor agonist. Identity, structure, nomenclature and the published research record. For laboratory research use only.
Compound referenceWhat Is Semaglutide?
What is Semaglutide? A GLP-1 receptor agonist studied in metabolic signaling and energy-balance research models. Sourced to a ≥99% HPLC specification.
Growth Hormone Secretagogues
What Is CJC-1295 (No DAC)?
What is CJC-1295 No DAC? A modified GRF (1-29) GHRH analog studied in somatotropic-axis and GH-secretagogue research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Ipamorelin?
What is Ipamorelin? A selective ghrelin-receptor (GHS-R) agonist studied in GH-secretagogue and somatotropic-axis research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Tesamorelin?
What is Tesamorelin? A stabilized 44-amino-acid GHRH analog studied in lipid-metabolism and somatotropic-axis research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Sermorelin?
What is Sermorelin (GRF 1-29)? A GHRH analog studied in somatotropic-axis and GHRH-receptor signaling research. Sourced to a ≥99% HPLC specification.
Tissue Repair & Cytoprotection
What Is BPC-157?
What is BPC-157? A 15-amino-acid gastric peptide studied in cytoprotection, tissue-repair, and gut-barrier research models. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is TB-500?
What is TB-500? Full-length synthetic Thymosin Beta-4 (4,963.4 Da) studied in actin-regulation, tissue-repair, and angiogenesis research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is GHK-Cu?
What is GHK-Cu? A copper(II)-binding tripeptide complex studied in extracellular-matrix and tissue-remodeling research models. Sourced to a ≥99% HPLC specification.
Mitochondrial & Epigenetic
What Is MOTS-c?
What is MOTS-c? A 16-amino-acid mitochondrial-derived peptide studied in AMPK signaling and metabolic-homeostasis research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Epithalon?
What is Epithalon (Epitalon)? A synthetic tetrapeptide (Ala-Glu-Asp-Gly) studied in telomere and cellular-senescence research. Sourced to a ≥99% HPLC specification.
Neuroendocrine & Receptor
What Is PT-141?
What is PT-141 (Bremelanotide)? A cyclic melanocortin-receptor (MC4R) agonist studied in neuroendocrine signaling research. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Kisspeptin-10?
What is Kisspeptin-10 (KP-10)? A decapeptide GPR54/KISS1R agonist studied in reproductive-axis and neuroendocrine research. Sourced to a ≥99% HPLC specification.
SERM & Hormone Modulator
Additional Research Guides
What Is DSIP?
What is DSIP? A nonapeptide isolated in 1977 from sleeping rabbits and still without an identified receptor. Sequence, evidence and limits. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is SS-31?
What is SS-31? A cell-permeable tetrapeptide that binds cardiolipin in the inner mitochondrial membrane, studied in bioenergetics models. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is NAD+?
What is NAD+? A dinucleotide coenzyme — not a peptide — studied as the consumed substrate of sirtuins, PARPs and CD38. Sourced to a ≥99% HPLC specification.
Compound referenceWhat Is Glutathione? Research Overview
Glutathione (GSH), the 307.33 Da gamma-glutamyl tripeptide thiol, for in-vitro redox research. >=99% HPLC purity with batch CoA.
Compound referenceWhat Is HCG? Research Overview
HCG (human chorionic gonadotropin), CAS 9002-61-3, lyophilized glycoprotein for laboratory research. >=99% purity standard with third-party HPLC CoA.
Compound referenceWhat Is HGH? Research Overview
HGH (human growth hormone) research reference data: receptor pharmacology, isoform literature, storage, >=99% by HPLC sourcing standard and batch CoA.
Compound referenceWhat Is KPV? Research Overview
KPV (Lys-Pro-Val, CAS 67727-97-3, ~342.4 Da) research tripeptide supplied at >=99% HPLC purity with batch third-party CoA for laboratory use only.
Compound Reference Entries
A reference entry is a verified chemical identity record: CAS number, molecular formula and weight, PubChem CID, and a bibliography of real, resolvable literature. It is a distinct document from the research guides above, which cover mechanism and application at length. 27 compounds are catalogued here across 9 classifications, each with the date its identity was last verified and by whom.
Cosmetic Signal Peptides
GnRH & Reproductive Peptides
Growth Hormone Secretagogues
Incretin Mimetics
Melanocortin Agonists
Metabolic & Mitochondrial Peptides
Neuropeptides & Nootropics
Thymic & Immune Peptides
Miscellaneous Research Peptides
Research Use Only. All products listed on Peptide.Express are intended for laboratory research and educational purposes only. Research guides describe receptor pharmacology and applications for scientific context, and reference entries publish chemical identity and citations only. No human or therapeutic use is implied.