^{【Product Overview】}

^{We are a specialized global supplier of Leu-Enkephalin (Leucine Enkephalin), the essential endogenous pentapeptide counterpart to Met-Enkephalin. Acting primarily as an agonist at the δ(delta) opioid receptor, it plays a fundamental role in regulating nociception (pain), stress responses, and reward pathways. We provide high-purity, synthetic Leu-Enkephalin to neuroscience laboratories and pharmaceutical developers, offering the critical "Twin Standard" required for comparative opioid research.}

^{【Key Advantages】}

^{Superior Oxidative Stability: Unlike Met-Enkephalin, which contains a sulfur-based Methionine residue prone to oxidation, Leu-Enkephalin features a Leucine residue at the C-terminus. This structural difference grants it greater chemical stability in solution, making it a preferred ligand for longer-duration receptor binding assays.}

^{Receptor Selectivity Research: While both enkephalins bind to μ and δ receptors, Leu-Enkephalin is frequently utilized in studies aiming to differentiate between receptor subtypes and to investigate the modulation of neuroendocrine functions.}

^{The "Enkephalin Standard": No pain research library is complete without both isomers. We supply Leu-Enkephalin that meets the exact same rigorous quality standards as our Met-Enkephalin, ensuring consistency across your comparative experiments.}

^{High Purity & Solubility: We guarantee ≥98.0% purity (HPLC). Our product is highly soluble in water and saline, ensuring easy preparation for in vitro and in vivo administration.}

^{【Logistics & Service】}

^{Cold Chain Logistics: We utilize validated thermal packaging (VIP box + ice packs) to ensure the peptide maintains its integrity during global transit.}

^{Global Export: We are experienced in shipping neuroscience peptides. We provide full HS Code support (typically 2937.19) and non-controlled substance declarations to facilitate smooth customs clearance to the US, EU, and Asia.}

^{Analytical Rigor: A comprehensive Certificate of Analysis (COA), Mass Spectrometry (MS), and HPLC chromatogram are provided with every batch to validate identity and purity.}

Regulatory Disclaimer: This product is supplied as a Chemical Reference Standard or API Intermediate for laboratory research (R&D) and further manufacturing use only. It is NOT intended for direct human therapeutic use, clinical injection, or patient administration without regulatory approval.