DSIP

DSIP (Delta Sleep-Inducing Peptide) is a small, naturally occurring peptide first isolated in the 1970s from the cerebral blood of sleeping rabbits and studied mainly for its effects on sleep, stress, and hormone release. It is a research chemical, not an approved medicine, and is not a proven human therapy. Everything here is for education only and is not medical advice or a recommendation to obtain or use it.

What is DSIP?#

DSIP is a nine-amino-acid peptide (a "nonapeptide") with a molecular weight of roughly 850 daltons. It was first identified by a Swiss research group that isolated a sleep-promoting substance from the cerebral venous blood of rabbits placed in an induced sleep state. The peptide was later reported in both free and protein-bound forms in brain regions such as the hypothalamus, the limbic system, and the pituitary, as well as in some peripheral tissues and body fluids.

Despite its name, decades of research have not fully resolved what DSIP does in the body, and a frequently cited 2006 review described it as a "still unresolved riddle." For research and sale it is usually supplied as a lyophilized (freeze-dried) white powder that must be reconstituted with a sterile diluent before it can be measured in liquid form. It is commonly labeled "for research use only."

How does DSIP work?#

The proposed mechanisms come mostly from older animal and laboratory studies, so they should be read as hypotheses rather than settled facts. Reported observations include:

• A sleep-modulating effect that appears greater when sleep is already disturbed and minimal in healthy sleepers, which is why some researchers describe it as a sleep-promoting substance rather than a sedative.
• Transport across the blood-brain barrier by a high-affinity, saturable mechanism, allowing it to reach brain regions involved in sleep regulation.
• Influence on hormone release, including reports that it can affect corticotropin, luteinizing hormone, growth hormone, and somatostatin, in some cases through a proposed dopaminergic pathway.
• A possible role as a stress-limiting factor affecting neurotransmitter levels and circadian patterns.

A practical complication is that DSIP breaks down very quickly in blood, so how a naturally short-lived peptide could exert lasting effects remains debated. None of these mechanisms has been confirmed in adequately powered modern human trials. A licensed clinician is the right person to interpret what, if anything, this means for an individual.

What is DSIP studied for?#

The DSIP literature is dominated by older preclinical work, with only a handful of small human studies. The table below summarizes common research themes and their evidence level in humans.

The recurring caveat applies throughout: animal results do not reliably predict human outcomes, the human sleep data are decades old and involve very small numbers of participants, and DSIP has not been validated as a treatment for any condition.

Is DSIP legal and FDA-approved?#

DSIP is not FDA-approved and is not a recognized dietary supplement, so it cannot lawfully be marketed for human consumption in the United States. It has appeared in FDA pharmacy-compounding deliberations under the name emideltide and, as of mid-2026, was being considered by the Pharmacy Compounding Advisory Committee for the Section 503A bulk drug substances list rather than being approved as a drug. Until and unless a regulator approves it, it remains a research compound. Anti-doping rules and national laws differ, and broad anti-doping categories can capture peptide hormones, so anyone subject to drug testing or considering use should verify the current rules where they live and consult a licensed professional.

How is DSIP dosed?#

There is no validated human dose. The small older human studies used amounts that do not translate into safe, current human guidance, and there is no modern dosing standard. WikiPeps does not publish dosing protocols. Any decision about quantity, route, or frequency is a medical decision that belongs with a licensed clinician who knows your history.

How is DSIP reconstituted?#

Lyophilized DSIP is reconstituted by slowly adding a sterile diluent (such as bacteriostatic water) to the vial and gently swirling until the powder fully dissolves. The numbered steps in the "How To" section above outline the general, education-only handling process. This page does not specify diluent volumes or concentrations; those are measurement decisions to discuss with a licensed clinician who knows your situation.

What are the safety considerations?#

Human safety data are sparse and out of date because rigorous modern clinical trials have not been completed. The few older human studies reported relatively few effects, with occasional transient headache, nausea, or dizziness, but these were small studies and tell us little about long-term safety. That uncertainty is itself a safety concern: unknown long-term effects, variable product purity in the research-chemical market, and the absence of regulatory oversight all raise risk. Sterility during handling matters, and contamination can cause infection. Because of these unknowns, the only responsible step before considering any peptide is a conversation with a licensed clinician.

The bottom line#

DSIP is a naturally occurring peptide with an intriguing history and a small, dated body of evidence centered on sleep and stress. It is not FDA-approved, not proven in humans, and not a validated treatment for insomnia or anything else. Treat everything here as education, verify the law where you live, and talk to a licensed clinician before making any health decision.