DSIP: Delta Sleep-Inducing Peptide Research Profile

DSIP was one of the first peptides isolated for a specific electroencephalographic association — the delta (slow-wave) sleep pattern — and it remains a recurring subject in sleep and stress research precisely because its biology never fit neatly into a single pathway.

The molecule

Delta sleep-inducing peptide is a nonapeptide (C₃₅H₄₈N₁₀O₁₅, ≈ 849 g/mol), first characterized from rabbit cerebral blood by Schoenenberger and Monnier in 1977. Its name comes from the original observation, but the research literature treats it as a broader neuropeptide with effects reported across sleep, stress, and endocrine regulation.

What the research looks at

DSIP appears across several distinct research threads:

• Sleep-wake regulation — the original association with delta activity in EEG studies
• Stress-response modulation — effects on the HPA axis reported in animal models
• Endocrine and metabolic regulation — including interactions with growth-hormone and metabolic signaling
• Neuroprotective research — where its presence in both blood and brain tissue makes it a candidate in CNS peptide studies

Because its mechanism is not a single clean receptor pathway, DSIP research tends to be descriptive and systems-level: what changes in sleep architecture, stress markers, and neuroendocrine output when the peptide is present.

Regulatory status (2026)

DSIP sat on the FDA’s 503A Category 2 “significant safety risks” list under the June 2025 categorical framework. In April 2026 it was one of twelve peptides removed from Category 2 — which lifts the compounding-prohibition flag but grants nothing: DSIP was not among the seven substances PCAC voted on in July 2026, so its evaluation is still queued. For research buyers the practical read is documentation discipline, not deregulation — see the 2026 regulatory timeline.

Handling notes

DSIP is lyophilized and reconstituted with bacteriostatic water; the reconstitution calculator does the liquid math. Store at −20°C lyophilized, protect from light.

See DSIP for CAS, purity and full specifications.

For laboratory research use only. Not medical advice.