What's on the label is the measured result — net peptide mass, not gross powder weight, plus RP-HPLC purity, on a lot-numbered COA for every batch.
Net peptide mass and RP-HPLC purity — a lot-numbered COA for every batch.
Net peptide mass + HPLC purity, per lot.
PCAC will review 7 peptides for the 503A bulks list, BPC-157, KPV, TB-500, MOTS-c, Emideltide, Semax, Epitalon. Read our briefing →
PCAC will review 7 peptides for the 503A bulks list. Read →
FDA PCAC reviews 7 peptides in July. Read →
Delta sleep-inducing peptide
PeptideXpo buyer fit
This PeptideXpo page is intentionally positioned for distributors, OEM buyers, and procurement teams comparing DSIP inside a wider peptide catalog. It is not trying to be the deepest single-molecule monograph; the differentiated intent is assortment planning, export-ready documentation, fill-size comparison, and whether this SKU belongs in a broader buyer program.
Overview
DSIP (Delta Sleep-Inducing Peptide) is a nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) originally isolated from rabbit cerebral venous blood during electrical stimulation of sleep-promoting brain regions. The molecule has been studied since the 1970s for its proposed role in slow-wave (delta) sleep regulation, stress-response modulation, and neuroendocrine effects on cortisol and GH release. Despite decades of research, DSIP's precise receptor target remains unidentified, the molecule's pharmacology is mechanistically less well-characterized than other cognitive-research peptides, which is the basis for the ongoing research interest. PeptideXpo supplies DSIP as a lyophilized powder at ≥99.0% HPLC purity. The standard analytical packet covers peak-integration HPLC, mass spec, water content, and counter-ion. Standard fill sizes (2-15 mg) cover most research workflows. Buyers should note that DSIP is exceptionally hygroscopic compared with other short peptides, vials should be reconstituted promptly after opening and unused powder should be stored sealed under nitrogen or dry argon when possible. Reconstituted solutions should be aliquoted into single-use volumes and held at -20 °C with strict freeze-thaw management.
Who buys this, and why
Cognitive and neuropeptide buyers are predominantly research labs running in vivo rodent studies. The dominant administration route in the literature is intranasal, these peptides are not meaningfully blood-brain-barrier permeable when delivered systemically. For in vivo workflows, endotoxin and microbial-limit testing is recommended at the COA stage so the bioassay readout is not confounded by contamination unrelated to the test article.
Primary buyer fit: academic and contract research laboratories.
Specifications
Documentation available on request
Regulatory note
Sold for research use under the receiving laboratory's local regulations. Not a finished dosage form and not labeled for human administration. In vivo research workflows should additionally request endotoxin and microbial-limit testing on the specific batch.
Frequently asked questions
DSIP's effects in sleep, stress, and neuroendocrine research models are well-documented across decades of literature, but the molecule's primary receptor binding site has not been definitively identified. Proposed mechanisms include modulation of GABAergic transmission, indirect effects on melatonin and serotonin pathways, and direct or indirect interaction with adenosine receptor signaling in sleep-promoting brain regions. The orphan-receptor status is unusual for a peptide with reproducible behavioral effects and is part of why DSIP remains an active research target rather than a fully-characterized pharmacological tool.
DSIP's sequence is unusually polar, multiple Asp, Glu, Ser, and Gly residues with very few hydrophobic anchors, which produces a lyophilizate that absorbs ambient moisture more rapidly than most short peptides. Practical handling: minimize the time the vial is open in ambient air, reconstitute promptly after first opening, and consider storing partially-used vials under dry nitrogen or argon. Water uptake doesn't directly destroy DSIP, but it accelerates hydrolytic degradation pathways during long-term storage and shifts the concentration of any subsequent reconstitution by a few percent.
