Peptides for Weight Loss: What They Are and How They Work GoodRx Is DSIP Delta Sleep Inducing Peptide Safety?_Chemicalbook DSIP QRP Nutrition 5mg Deep Sleep, Stress Relief & Recovery Buy DSIP 5mg Neuropeptide Research Circadian Rhythm Signaling Pathways There's a lot of confusion around peptides and muscle. Here's how I actually think about it. Most peptides don't build muscle directly. They improve the systems that allow muscle to grow. First, Delta Sleep Inducing Peptide (DSIP) Phoenix Pharmaceuticals, Inc.