Delta Sleep Inducing Peptide an overview ScienceDirect Topics 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 Understanding DSIP: Benefits and Uses of Delta Sleep Inducing Peptide Buy DSIP (Delta Sleep Inducing Peptide) (5mg) 99% Purity, USA Made