Have you heard of DSIP? In this study, delta sleep induced peptide was given to only 17 participants! But it helped improve their sleep markers.. unfortunately only 17 patients used but they were DSIP Seenergie PH How to look much younger within a year , GHK Cu is one of the most studied skin peptides on the planet, it stimulates collagen production, improves firmness, and helps skin recover from damage., I Delta Sleep Inducing Peptide an overview ScienceDirect Topics