● pepmg Research Desk · Peer-reviewed evidence review
What the research says about DSIP
A neutral summary of the peer-reviewed literature on DSIP (delta sleep-inducing peptide), a nine-amino-acid peptide studied mainly in animal models, with a small human literature that is old and inconclusive. Research use only.
Limited evidence — Early or small human data, or strong preclinical work. This describes the state of the published literature, not a claim that this compound works, is safe, or is for human use. Research use only.
The short version
- DSIP (delta sleep-inducing peptide) is a nine-amino-acid peptide first isolated from rabbit blood and studied mainly in animal models of sleep, pain, and stress [3][5].
- Two small human studies from the early 1980s reported effects on sleep, and animal work examined EEG, antinociceptive, and other actions [1][2][5][6].
- Reviews note that the link between DSIP and sleep has never been firmly established and remains poorly documented, so the evidence base is thin and dated [3][4].
- This page reports what the studies measured. It is not medical advice, an efficacy or safety claim, or dosing guidance. Research use only.
What DSIP is
DSIP (delta sleep-inducing peptide) is described in the literature as a nine-amino-acid peptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) that was isolated from rabbit cerebral venous blood in 1977 and originally proposed as a candidate sleep-promoting factor [3][5]. It is sold by third-party research-chemical vendors and is offered for laboratory and research use only.
Most of the published DSIP research is preclinical, carried out in animals; the human literature is limited to a few small, mostly old studies, and reviews describe its natural role and biological activity as still obscure [3][4].
What the research has measured
Limited evidenceIn animal studies, DSIP has been examined across several systems. In its founding characterization, synthetic DSIP infused into the brain ventricles of rabbits produced enhancement of slow-wave (delta) and spindle EEG patterns, while related analogues did not [5]. Other rodent work reported a dose-dependent antinociceptive effect that was blocked by an opioid antagonist [6], and an intranasal-administration study in rats reported accelerated recovery of motor function after experimental stroke [7].
The human data are small and old. Two studies from the early 1980s reported effects on sleep after intravenous DSIP: one in chronic insomniacs described longer, less-interrupted sleep [1], and a placebo-controlled crossover study in healthy volunteers described increased sleep and better sleep efficiency without classic sedation [2]. Reviews of neuropeptides and sleep note that the impact of DSIP on human sleep regulation is not yet clear [4].
What the trials report on safety and adverse events
Limited evidenceThe human studies of DSIP are small and old, and their reporting of tolerability is correspondingly limited. The 1981 insomnia study reported no daytime sedation or other side effects at the tested dose [1], and the healthy-volunteer crossover study reported that the compound was well tolerated with no psychological, physiological, or biochemical side effects observed [2]. These are very small early studies, not large modern safety trials.
There are no large modern controlled trials establishing the safety of DSIP in the general population. This is not medical advice; the human safety of DSIP is not established. Consult a qualified professional and read the studies directly.
How strong is the evidence
Because the DSIP evidence base is mostly preclinical with only small, dated human studies, and reviews describe the DSIP-sleep link as poorly documented and still unresolved, it is characterized as limited [1][3][4]. "Limited" describes the state of the research, not a judgment of whether DSIP works or is safe, and it reflects the small size and age of the human literature.
Nothing here is dosing, medical, or safety guidance. Read the studies themselves and consult a qualified professional. This page is a map to the evidence, not a recommendation.
Sources · 7
- The influence of synthetic DSIP (delta-sleep-inducing peptide) on disturbed human sleep.
- Acute and delayed effects of DSIP (delta sleep-inducing peptide) on human sleep behavior.
- Delta sleep-inducing peptide (DSIP): a still unresolved riddle.
- Neuropeptides and human sleep.
- Characterization of a delta-electroencephalogram (-sleep)-inducing peptide isolated from rabbits.
- Potent antinociceptive effect of centrally administered delta-sleep-inducing peptide (DSIP).
- Delta Sleep-Inducing Peptide Recovers Motor Function in SD Rats after Focal Stroke.
pepmg summarizes the peer-reviewed literature and links to every source — it sells nothing, ships nothing, and gives no medical, dosing, or human-use guidance. Don't just trust this summary: follow any citation to its source and read it yourself. Research use only.