Two compounds are listed here. Selank, a nasal peptide studied around anxiolytic signaling and coming soon to Promise, is covered on its own page and on brain health and memory. This page is mostly about DSIP, and the most useful thing we can do with the space is be straight about it.
DSIP — delta sleep-inducing peptide — is a nonapeptide first described in the late 1970s, isolated from the cerebral blood of rabbits that were in slow-wave sleep at the time. It was named for the state it was found in, not for a demonstrated effect. Half a century later that name still does more work in marketing copy than the evidence supports.