Sleep · Nootropic
DSIP
Also known as: Delta Sleep-Inducing Peptide, Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu
A nonapeptide originally isolated from rabbit brain in 1977, proposed to influence sleep architecture and stress response, with limited and inconsistent human trial evidence.
Sign in to add to watchlistEvidence strength
Strength of human clinical evidence — A (strongest) to D (mostly preclinical). This reflects research maturity, not safety or suitability.
Vial Theory provides educational research summaries only. Content is not medical advice, diagnosis, treatment, dosing guidance, or individualized suitability screening. Regulatory status can change over time and varies by jurisdiction.
Key Takeaways
- ›DSIP is a nine-amino-acid peptide first isolated from rabbit brain in 1977.
- ›No specific receptor or clear mechanism has been established despite decades of research.
- ›Human studies for sleep, withdrawal, and pain have been small and inconsistent.
- ›It is not FDA-approved, and long-term safety is uncharacterized.
- ›Claims that it reliably improves sleep exceed the evidence. Consult a licensed healthcare professional.
What It Is
Delta Sleep-Inducing Peptide (DSIP) is a nonapeptide originally isolated from the cerebral venous blood of electrically stimulated sleeping rabbits by Schoenenberger and colleagues at the University of Basel in 1977. Its name reflects the initial observation that infusion into recipient rabbits appeared to induce slow-wave (delta) sleep-like EEG patterns.
The biological identity and mechanism of DSIP have remained surprisingly unsettled across decades of research. No high-affinity receptor for the peptide has been definitively characterized. The proposed effects span sleep induction, modulation of stress response, antinociception, alcohol-withdrawal symptom relief, and various neuroendocrine effects. The breadth of proposed effects and the absence of a clearly defined receptor target distinguish DSIP from peptides like GLP-1 or kisspeptin that have well-defined molecular targets.
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Disclaimer: This content is for educational and research purposes only and is not medical advice. Always consult a licensed healthcare professional before making health-related decisions.