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Kisspeptin (also known as Metastin or Kisspeptin-10) is a naturally occurring neuropeptide encoded by the KISS1 gene, acting through the KISS1R / GPR54 receptor. Extensively studied in preclinical and clinical research for its role in reproductive endocrinology, hypothalamic GnRH regulation, and HPG-axis signaling pathways. Lyophilized powder, ≥99% purity, third-party tested. For laboratory and research use only — not for human consumption.