DSIP

DSIP (also known as Delta Sleep Peptide, DSIP nonapeptide) is a nootropic research peptide. A neuropeptide originally isolated from rabbit cerebrospinal fluid during slow-wave sleep. Studied for sleep regulation, stress buffering, pain modulation, and antioxidant effects across decades of European research.

DSIP (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) is a nonapeptide first isolated in 1974 from the cerebral venous blood of rabbits induced into slow-wave sleep by electrical stimulation of the thalamus. It crosses the blood-brain barrier. Research attributes to it multiple physiological roles: induction of delta-wave (slow-wave) sleep, reduction of ACTH and cortisol under stress, modulation of opioid pathways for pain, antioxidant activity, and normalization of blood pressure. Uniquely, it exhibits amphoteric stress-buffering — reducing stress-induced cortisol without suppressing baseline HPA axis function.

1 Mechanism of action

Modulates sleep-wake cycle via thalamic and limbic pathways. Buffers HPA axis stress response without suppressing baseline cortisol. Interacts with opioid receptors for analgesia. Antioxidant activity via reduction of lipid peroxidation.

Primary targets: Opioid receptors (partial) · HPA axis (modulatory) · Thalamic sleep circuits

2 Reported effects

Effects below are those reported in the published literature cited on this page. They are not claims of clinical benefit and not medical advice.

2.1 Reported benefits

• Promotes natural delta-wave (slow-wave) deep sleep
• Stress-buffering via HPA axis amplitude modulation
• Analgesic effects through opioid pathway modulation

2.2 Side effects

• Daytime drowsiness (dose-dependent)
• Mild headache upon waking
• Inconsistent response rates in human studies

3 Chemical and physical properties

3.1 Amino acid sequence

4 Research dosages

100–300 μg SC before bedtime in research protocols.

5 Research studies (8)

1. Delta Sleep-Inducing Peptide: Discovery and Pharmacology
   Experientia (1977) · Preclinical · N=24 (rabbits/cats)
   Original characterization of DSIP. Describes isolation from rabbit CSF and initial sleep-inducing effects in cats and rabbits via EEG delta-wave induction.
   Key finding: DSIP infusion induced delta-wave (slow-wave) EEG patterns within minutes — first identification of an endogenous sleep peptide.
2. DSIP: An Overview of Its Effects on Stress, Pain, and Sleep
   Peptides (1984) · Review · N/A (review)
   Review covering DSIP biology: HPA axis modulation, analgesic effects via opioid system interaction, and antioxidant properties in animal models.
   Key finding: DSIP uniquely buffers stress-induced cortisol spikes without suppressing baseline cortisol — an amphoteric HPA modulator.
3. Delta Sleep-Inducing Peptide Recovers Motor Function in SD Rats after Focal Stroke
   Molecules (Basel, Switzerland) (2021) · Preclinical
   Intranasal administration of DSIP in the course of 8 days leads to accelerated recovery of motor functions.
4. Phosphorylated delta sleep inducing peptide restores spatial memory and p-CREB expression by improving sleep architecture at high altitude
   Life sciences (2018) · Preclinical
   SIGNIFICANCE: Our study demonstrates that improvement of sleep quality by p-DSIP restores spatial memory by up regulating CREB phosphorylation during simulated high altitude hypoxia.
5. Expression and Purification of Delta Sleep-Inducing Peptide Fused with Protein Transduction Domain and Human Serum Albumin in Pichia pastoris
   Protein and peptide letters (2017) · Preclinical
   PHD fusion protein increased the hypnotic effects of pentobarbital by reducing sleep latency and prolonged sleep duration.
6. Effect of Delta Sleep-Inducing Peptide on Functional State of Hepatocytes in Rats During Restraint Stress
   Bulletin of experimental biology and medicine (2016) · Preclinical
   Increasing the peptide dose to 360 μg/kg abolished its effects.
7. [THE INFLUENCE OF DELTA SLEEP-INDUCING PEPTIDE ON FUNCTIONAL STATE OF RATS HEPATOCYTES IN FOOT-SHOCK STRESS]
   Rossiiskii fiziologicheskii zhurnal imeni I.M. Sechenova (2015) · Preclinical
   The stress-induced increase in serum alanine aminotransferase activity was normalized by peptide administration in the doses of 120, 360, and 1080 mcg/kg.
8. Effect of delta sleep-inducing peptide on the expression of antioxidant enzyme genes in the brain and blood of rats during physiological aging
   Bulletin of experimental biology and medicine (2014) · Preclinical
   The expression of these genes was shown to decrease during physiological aging of the body.

6 Safety and risk profile

6.1 Regulatory status

DSIP is currently classified as Investigational. It has no approved human indication in the United States; availability elsewhere does not imply demonstrated safety or efficacy.

Safety score: 52/100 — moderate concern. Derived from clinical data volume, known risks and regulatory status.

6.2 Contraindications

Conditions and populations in which use is contraindicated:

• Obstructive sleep apnea (may deepen apnea events)
• Concurrent use with CNS depressants
• Pregnancy (no safety data)

6.3 Drug interactions

6.4 Long-term risks

• Potential sleep architecture disruption with chronic use
• Development of tolerance (limited long-term data)
• Unknown effects on natural opioid receptor sensitivity

6.5 Research best practices

• Store at −20 °C; protect from light
• Administer immediately before sleep onset
• Begin with low dose (50–100 μg) to assess individual response
• Reconstitute with saline (not bacteriostatic water — benzyl alcohol may reduce potency)

7 Frequently asked questions

How does DSIP affect sleep quality?

Unlike sedatives that force unconsciousness, DSIP promotes natural delta-wave (deep slow-wave) sleep — the most restorative sleep stage. Research shows it increases time spent in deep sleep while preserving normal sleep architecture.

Does DSIP have effects beyond sleep?

Yes. DSIP has been shown to buffer stress-induced cortisol spikes (without suppressing baseline cortisol), modulate pain perception via opioid pathways, and reduce oxidative stress — making it a multi-functional neuropeptide beyond sleep research.

8 References

1. Delta Sleep-Inducing Peptide Recovers Motor Function in SD Rats after Focal Stroke PubMed (2021). Tukhovskaya EA, et al.. View source
2. Phosphorylated delta sleep inducing peptide restores spatial memory and p-CREB expression by improving sleep architecture at high altitude PubMed (2018). Roy K, et al.. View source
3. Expression and Purification of Delta Sleep-Inducing Peptide Fused with Protein Transduction Domain and Human Serum Albumin in Pichia pastoris PubMed (2017). Zhang XG, et al.. View source
4. Effect of Delta Sleep-Inducing Peptide on Functional State of Hepatocytes in Rats During Restraint Stress PubMed (2016). Bobyntsev II, et al.. View source

9 See also

• Peptide encyclopedia index
• Peptide reconstitution calculator
• Glossary of peptide research terms