DSIP is a naturally occurring neuropeptide known as delta sleep-inducing peptide, originally isolated in the context of sleep and neuroregulatory research. It has been studied in cognitive and neuroendocrine research for its relationship to sleep architecture, stress signaling, circadian modulation, and central nervous system activity across experimental models. Its compact peptide structure and hypothalamic signaling associations have kept it relevant within sleep-focused neuropeptide research for decades. Lyophilized powder, 3mL vial. Sold at 5mg per vial. For research use only.