DSIP
Also known as Delta Sleep-Inducing Peptide, Delta sleep inducing peptide
DSIP (Delta Sleep-Inducing Peptide) is a naturally occurring nonapeptide studied in sleep-regulation research. A research-use profile: its sequence, its discovery origin, and handling.
DSIP wears its research history in its name. Delta Sleep-Inducing Peptide was identified in the 1970s during work on sleep states, isolated from the cerebral venous blood of rabbits and named for the delta-wave sleep context in which it was first characterized. It is a genuinely small, naturally occurring molecule — nine amino acids, no unusual modifications.
That name is also a caution. 'Sleep-inducing' describes the historical research context in which the peptide was discovered and studied; on this store it is not a claim about what the compound does for anyone. DSIP is offered as a research material, and the page keeps to composition and context.
What makes DSIP worth a careful profile is how modest its structure is — a clean nonapeptide — set against how much has been written into its name. The verifiable facts are the useful ones.
DSIP is a nine-residue peptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) first isolated from the cerebral venous blood of rabbits during studies of sleep-related states. It is a small, unmodified linear sequence with no disulfide bonds.
Sequence and structure
DSIP is the nonapeptide Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu. It is a short linear chain with no cysteines and therefore no disulfide bridges, and it carries no acylation or other terminal modification in its native form. The glycine-rich middle of the sequence is a recognizable feature when checking a certificate.
Its small, unmodified nature means a mass-spectrometry trace should line up cleanly with a nine-residue peptide and an HPLC trace should resolve to a dominant single peak.
Discovery and naming
The peptide was isolated during electrophysiological sleep research and named for that setting. It is important to read the name as a label from its discovery context rather than as a description of an effect — the sleep-regulation literature is where DSIP has been studied, which is a statement about research history, not about outcomes.
In the years since, DSIP has appeared in a range of neuroendocrine and circadian-research discussions, which is why it is catalogued in the cognitive-and-sleep research area.
Reading a DSIP certificate of analysis
Confirm that the reported sequence matches the nine-residue Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu chain, that the mass corresponds to a nonapeptide, and that the lot carries its own batch identifier tied to a certificate. A purity figure without a stated method or batch tells you less than it appears to.
These are research areas the compound is associated with in the literature — not medical claims or intended uses.
Handling & storage
Supplied lyophilized. Stored sealed and cold; in research settings it is reconstituted with bacteriostatic water only when a protocol requires it, then kept refrigerated. Handle per accepted laboratory practice.
Verify a certificate by lot →Common questions
Delta Sleep-Inducing Peptide — a name from the sleep-research context in which it was discovered, not a description of an effect.
Nine amino acids (a nonapeptide): Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu, a short linear chain with no disulfide bonds.
From the cerebral venous blood of rabbits during sleep-state research in the 1970s, which is the origin of both the molecule and its name.
This monograph is a research-use reference. It describes composition and the contexts in which the compound has been studied — it is not medical advice, a description of effects, or a recommendation for use. Sold strictly for laboratory and research use; not for human or animal consumption.