Overview
In plain English
DSIP — Delta Sleep-Inducing Peptide — was discovered in the 1970s by collecting fluid from the brains of rabbits in deep sleep and finding it induced the same deep sleep in other animals.
It is used for sleep quality, particularly deep sleep, and for people whose sleep is disrupted by stress. It is taken 30 to 60 minutes before bed.
- What it isA nine-amino-acid peptide first isolated from the brain during deep sleep
- Mainly used forDeep sleep, sleep onset, stress-disrupted sleep
- Typical protocol200mcg 30–60 minutes before bed, 8–12 weeks
How it works
What it actually does
Honestly: nobody knows. That is the standing position in the published literature, not a hedge.
No receptor for DSIP has ever been identified, so there is no confirmed mechanism. Proposed contributions include effects on the brain's calming and stimulating signals and on stress hormone output.
It also clears from the blood very quickly, yet effects have been reported long after it is gone — which is exactly why researchers have called it an unresolved riddle.
The science in detail
DSIP originates in one of the more unusual isolation experiments in neuropeptide research. Working in Basel in the 1970s, Monnier and Schoenenberger perfused the cerebral ventricular system of rabbits during electrically induced delta-wave sleep and recovered a dialysate fraction that induced delta EEG activity when transferred to recipient animals. The active material was characterised as a nonapeptide and synthesised; Schoenenberger et al. (Pflügers Archiv, 1977) reported the amino acid analysis, sequence and activity of the synthetic compound.
The molecule is small, uncharged at several positions and carries no disulphide bridge. It is reported to cross the blood-brain barrier, and its plasma half-life is short — a combination that has complicated interpretation of the experimental literature, since measurable central effects have been reported at time points well beyond the peptide's detectable presence in circulation.
No specific DSIP receptor has been cloned or characterised. This is the central unresolved problem in the field, and it is the reason Kovalzon and Strekalova titled their mini-review in the Journal of Neurochemistry (2006) "Delta sleep-inducing peptide (DSIP): a still unresolved riddle". Without an identified binding site, the mechanistic literature is necessarily descriptive. Proposed contributions include modulation of GABAergic and glutamatergic tone, interaction with opioid systems, and influence on hypothalamic–pituitary–adrenal axis output.
The functional literature is correspondingly mixed. Reported observations extend well beyond sleep — into thermoregulation, stress adaptation, and oxidative stress models — and several groups have failed to reproduce the original delta-wave findings. Bes et al. (Neuropsychobiology, 1992) conducted a double-blind study in chronic insomniacs and reported statistically significant but weak effects on sleep efficiency and latency, with no improvement in subjective sleep quality; the authors concluded short-term administration was unlikely to be of major therapeutic benefit.
Mechanistically, DSIP is therefore unlike the GABA-A positive allosteric modulators that dominate hypnotic pharmacology. It is not a sedative in that sense, and the research interest lies in the endogenous regulatory system it may represent rather than in a defined receptor action.
Evidence
What the research shows
Discovered by transferring deep sleep
Fluid taken from rabbits in delta-wave sleep induced the same brain-wave pattern in recipient animals.
Sequence confirmed in 1977
The synthetic version was characterised and published as a nine-amino-acid peptide.
No receptor has ever been found
Fifty years on, the binding site and mechanism remain unidentified.
Human trial results were weak
A double-blind insomnia study reported only weak effects — worth knowing before you buy.
Mixing & dosage
How to mix and dose it
These are the mixing and dosage instructions supplied by Purist Peptides and the manufacturer for this product.
A 3ml vial of bacteriostatic water is included free with every peptide vial you order, so you have what you need to mix this on arrival.
DSIP 10mg
Step 1 — mix your vial
- Draw up 2ml of bacteriostatic water into a syringe
- Wipe the rubber top of your vial with an alcohol swab and let it dry
- Insert the needle then slowly and carefully push the water down the inside wall of the vial — do not inject water straight onto the peptide powder
- Gently roll the vial between your palms until the powder dissolves completely
- Do not shake
- Allow to settle in the fridge for 5–10 minutes. The liquid should look clear
Step 2 — draw & inject your dose
Use a 1ml insulin syringe to draw and inject your dose. A 1ml syringe = 100 units.
With 2ml of water added, each 0.1ml (10 units) you draw = 500mcg of DSIP.
| Stage | Dose | On the syringe |
|---|---|---|
| Starting | 100mcg daily | 2 units |
| Standard | 200mcg daily | 4 units |
Vial duration at standard dose: 50 days
When to inject: 30 to 60 minutes before bedtime.
Cycle length: 8 to 12 weeks, then take a break.
How to inject
- Wipe your injection site with an alcohol swab and let it dry
- Pinch a small fold of skin on your abdomen
- Insert the needle at a 45-degree angle into the pinched skin
- Slowly push the plunger down until empty
- Pull the needle out and apply gentle pressure with the swab
- Dispose of the needle safely in a sharps container — never recap or reuse
Storage
Keep refrigerated at 2 to 6 degrees Celsius at all times after mixing. Do not freeze. Protect from light and label the vial with the date you reconstituted it. Discard any solution that is hazy, discoloured or contains particles.
For informational purposes only. This is not medical advice. Speak to a qualified healthcare professional before starting any compound.
Questions
Frequently asked questions
What is DSIP studied for?
Published work covers sleep architecture and delta EEG activity, thermoregulation, stress adaptation and hypothalamic–pituitary–adrenal signalling, and oxidative stress models. The literature is small, spread across four decades, and inconsistent in its findings. Purist supplies the compound for laboratory research only.
Does DSIP bind a known receptor?
No. No DSIP receptor has been cloned or characterised, and this remains the principal open question in the field — the basis for Kovalzon and Strekalova's 2006 Journal of Neurochemistry review describing the peptide as a still unresolved riddle.
Why is the DSIP sleep literature inconsistent?
Several groups have been unable to reproduce the original delta-wave findings, and reported central effects often outlast the peptide's measurable presence in circulation. Study designs, routes and assay methods also vary considerably across the four decades of published work.
How does DSIP differ from GABAergic hypnotics?
Benzodiazepines and Z-drugs are positive allosteric modulators at the GABA-A receptor, a defined and well-characterised target. DSIP has no identified receptor and is not a sedative in that pharmacological sense; research interest centres on the endogenous system it may represent.
How is purity verified?
Every batch is assayed by independent HPLC at Bioindustrial Services in Boksburg. We do not rely on the manufacturer's own certificate alone. The assay report for the batch you receive is available on request, and our full testing protocol is set out at Quality Standards.
How long does delivery take?
Orders are dispatched from South Africa, with timelines varying by region and courier. Current dispatch and transit windows are set out at Delivery Process.
What is the returns policy?
Unopened vials in original condition may be returned under the conditions set out at Refund Policy.
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