Cognitive and sleep
DSIP has no established mechanism. Semax and Selank are registered medicines in one country and unknown elsewhere.
Covered here: Selank · Semax
DSIP is delta sleep-inducing peptide, a nine-amino-acid peptide first described in the 1970s and named for the effect its discoverers were looking for rather than for one that has been established. Its mechanism of action is the honest headline: there is no accepted one. Decades after it was first described, DSIP has no confirmed receptor, no agreed pathway, and no modern randomised human sleep trial, which is a rare combination for a compound this widely sold.
Semax and Selank are a different situation, and the reason is geographic rather than scientific. Both are Russian-developed peptides, Semax derived from a fragment of ACTH and Selank from the immune peptide tuftsin, and both are registered medicines in Russia. Very little of the literature supporting those registrations was published in the journals, or the language, that the rest of the world reads. The result is that these compounds are prescription drugs in one country and unknown research material almost everywhere else.
That is a translation problem, not a verdict in either direction. It means the question of what nootropic peptides do cannot be settled from the English-language record alone, and it also means a foreign registration is not equivalent to an FDA review. Our cognitive review works through how that evidence gap arose and what can and cannot be concluded from it.
Common questions
What is DSIP?
DSIP is delta sleep-inducing peptide, a nonapeptide first described in the 1970s and named after the sleep phenomenon its discoverers were investigating. It has been sold as a research compound for decades. It has never been approved as a drug in any major jurisdiction, and no modern randomised human sleep trial of it has been published.
What is DSIP’s mechanism of action?
There is no established mechanism of action for DSIP. No receptor has been confirmed as its target and no pathway is generally accepted in the literature. Sources that state a mechanism confidently are describing a hypothesis. For a compound first described over forty years ago, that absence is itself the most informative finding about it.
What is Semax?
Semax is a synthetic peptide derived from a fragment of adrenocorticotropic hormone, developed in Russia and registered there as a medicine. The research supporting that registration is largely Russian-language and predates the reporting standards applied to recent trials, which is why the compound is simultaneously a prescription drug in one country and an unfamiliar research peptide in most others.
What is Selank, and is it safe?
Selank is a synthetic peptide derived from the immune peptide tuftsin, developed in Russia and registered there as a medicine. On safety, the honest position is that the Russian registration implies a review process that is not publicly documented in the way an FDA file is, and no FDA review exists. Research-grade material sold under the name is not the registered product and carries no safety file at all.
What do nootropic peptides do?
Nootropic peptide is a marketing category rather than a pharmacological one, and the compounds grouped under it work on unrelated systems. For the best-known examples, Semax and Selank, the claimed effects come from a research record that is real but largely untranslated and rarely independently replicated. The category label suggests a shared, demonstrated effect that the published literature does not support.
What do sleep peptides do?
Sleep peptide usually means DSIP, which has no confirmed receptor, no accepted mechanism and no modern randomised human trial. There is no peptide with an established, trial-supported effect on human sleep architecture being sold in research channels. The name describes what was hoped for when the compound was discovered, not a demonstrated result.
Read the evidence
2 pieces on this subject, every finding attributed and every gap stated.
Related topics
For research use only · Not for human or veterinary use · No compound discussed here is FDA-approved for any indication