DSIP
Delta sleep-inducing peptide
A 40-year-old sleep peptide that never fully gave up its secrets
DSIP (delta sleep-inducing peptide) is a naturally occurring nonapeptide — Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu — first isolated from rabbit cerebral venous blood in 1977 by the Schoenenberger–Monnier group in Basel, named for its ability to enhance delta (slow-wave) EEG activity. Decades of study have looked at sleep, stress-hormone regulation, and pain, yet its mechanism and even its precise physiological role remain, in the literature's own words, unresolved.
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View DSIP →What the Research Actually Says
Every claim below is cited to the published literature and labeled by how far the evidence has actually progressed. Numbers refer to the reference list at the bottom of the page.
Sleep & delta-wave EEG
Early human trialsThe founding research area: DSIP was defined by its ability to promote slow-wave sleep after infusion in rabbits, and a handful of small human studies in the 1980s examined its effect on disturbed sleep. Results were modest and inconsistent, and no large modern trials have followed.
Stress & neuroendocrine effects
Preclinical (cell & animal)Animal work has reported effects of DSIP on stress-hormone regulation and on the response to a range of stressors, contributing to its description as a multifunctional regulatory peptide rather than a pure sleep agent.
An unresolved mechanism
Preclinical (cell & animal)Reviews spanning three decades note that despite a broad range of reported effects, no specific receptor or clear mechanism of action has been established — one 2006 review calls DSIP a 'still unresolved riddle.'
Where the Evidence Stops
- ◆There are no large modern randomized controlled trials of DSIP; the human literature is small and concentrated in the 1980s–90s.
- ◆No specific DSIP receptor or definitive mechanism of action has been identified, decades after its discovery.
- ◆Reported effects range widely (sleep, stress, pain, thermoregulation), which is itself a reason for caution — broad, non-specific effect profiles are hard to interpret.
- ◆Human dosing, bioavailability, and long-term safety are not established.
Research-grade DSIP, batch-documented
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References
- Schoenenberger GA, Monnier M Characterization of a delta-electroencephalogram (-sleep)-inducing peptide. Proceedings of the National Academy of Sciences, 1977.
- Graf MV, Kastin AJ Delta-sleep-inducing peptide (DSIP): a review. Neuroscience & Biobehavioral Reviews, 1984.
- Kovalzon VM, Strekalova TV Delta sleep-inducing peptide (DSIP): a still unresolved riddle. Journal of Neurochemistry, 2006.
- Schneider-Helmert D, Schoenenberger GA The influence of synthetic DSIP (delta-sleep-inducing peptide) on disturbed human sleep. Experientia, 1983.
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Published 2026-08-25. Reviewed against the cited primary literature.
This page is for educational purposes only and is not medical advice. Peptides discussed here are research compounds; nothing here is a recommendation to use them. Consult a qualified healthcare provider about anything affecting your health.