Buy DSIP (Delta Sleep Inducing Peptide) (5mg) Biotech Peptides Asp5) Delta Sleep Inducing Peptide (DSIP isoD) Polypeptide MedChemExpress DSIP (Delta SleepInducing Peptide) is a naturally occurring neuropeptide first isolated in 1974. It's best known for its potential role in regulating sleep, stress, and neuroendocrine function. Here's a clear breakdown of 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