DSIP was isolated in 1977 as a possible sleep factor. Nearly 50 years later, its gene and receptor remain unknown. See what the research actually shows.
Selank and Semax share a Pro-Gly-Pro tail but come from different parent molecules. Compare their origins, research areas, and the limits of the evidence.
KPV is a three-amino-acid fragment of alpha-MSH studied in mouse colitis models. See what the cell and animal data show and why human data is still missing.
GHK-Cu is a copper-binding tripeptide studied in wound and collagen research. See what cell, animal, and human studies show, and where the evidence stops.