Delta SleepInducing Peptide (DSIP) is a small naturally occurring peptide that was first identified in the 1970s and is associated with regulating sleep, particularly deep (delta) sleep phases. It's composed of 9 DSIP 99%+ Pure Peptide Amino Club Amino Club Is DSIP Delta Sleep Inducing Peptide Safety?_Chemicalbook Frontiers Pichia pastoris secreted peptides crossing the blood brain barrier and DSIP fusion peptide efficacy in PCPA induced insomnia mouse models