DSIP: Delta Sleep Inducing Peptide 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 SEMAX SELANK DSIP Blend Beverly Hills Rejuvenation Center Unraveling the Mysteries of DSIP DSIP Research Guide Canada Delta Sleep Inducing Peptide