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 Peptides for In Vitro Research PeakForce Labs About 50% of people will say it's a miracle while the other 50% will say it's useless. Read these papers yourself and find out where you stand. Half Life: Decay Low Def Pack Mod for Half Life: Decay HL:D Mods DSIP Deep Sleep & Stress Regulation Peptide biolabshop.co.uk