Delta-sleep-inducing peptide

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Medical disclaimer. This article is for informational purposes only and does not constitute medical advice. Consult a qualified clinician before considering any compound discussed below. See Retapedia : Medical disclaimer.

Summary

What it does
Delta-sleep-inducing peptide is used for deeper sleep. The link to human sleep is weak, so it may do little.
How it works
A natural brain peptide, a small protein messenger made by nerve cells. Its name comes from the deep-sleep brain waves it produced in laboratory work. How it acts in the human brain is still poorly understood.
WADA status
Prohibited by the World Anti-Doping Agency (WADA). Drug-tested athletes cannot use it.

Delta-sleep-inducing peptide is a compound studied for its effects on sleep. Delta-sleep-inducing peptide (DSIP) is a neuropeptide tied to animal EEG sleep activity; its human sleep role is weak. Shows preclinical antiepileptic activity.

Delta-sleep-inducing peptide (DSIP) is a neuropeptide that when infused into the mesodiencephalic ventricle of recipient rabbits induces spindle and delta EEG activity and reduced motor activities. DSIP is not named individually on the World Anti-Doping Agency (WADA) Prohibited List, and because it is registered in Russia as the medicine Deltaran, category S0 (non-approved substances) does not clearly reach it, so its status is genuinely unsettled; it is treated here as prohibited as the conservative default.

Natty status
Delta-sleep-inducing peptide is classified as not natty. It is prohibited by WADA and most natural bodybuilding federations. Use places the athlete in the enhanced category. See § Natty status.
Contents [hide]
  1. 1 Mechanism of action
  2. 2 Reported effects
  3. 3 Natty status
  4. 4 Research
  5. 5 Related compounds
  6. 6 Frequently asked questions
  7. 7 References
  8. 8 External links

Mechanism of action

A neuropeptide named for inducing delta EEG sleep activity in animals, though its own link to human sleep is weak and poorly characterized. Shows preclinical antiepileptic activity.

Reported effects

Effects reported in the literature and from preclinical models include:

  • DSIP and its analogues are proposed as endogenous stabilizers of brain excitability and potent antiepileptics in metaphit-induced generalized audiogenic convulsive activity. [1] Preclinical
  • Certain artificial DSIP structural analogues significantly promoted slow-wave sleep in rabbits and rats, though DSIP itself did not. [2] Preclinical
  • A naturally occurring dermorphin-decapeptide structurally similar to DSIP promoted slow-wave sleep in rabbits, while its optical isomer suppressed sleep. [2] Preclinical
  • Biochemical and physiological studies in vitro revealed a large spectrum of DSIP biological activity. [2] Preclinical
  • DSIP-like immunoreactivity occurs in the neurosecretory hypothalamic nuclei of various vertebrate species, in regions not particularly relevant to sleep regulation. [2] Preclinical
  • The hypothesis that DSIP itself is a sleep factor remains poorly documented and weak, partly because the DSIP gene, protein, and possible receptor have not been isolated. [2] Anecdotal

Evidence grades: FDA approvedApproved (non-US)Phase IIIPhase IIPhase IPreclinicalAnecdotal

Natty status

See also: Peptide § Natty status

Delta-sleep-inducing peptide is classified as not natty. It appears on the WADA prohibited list and is banned by major natural bodybuilding federations.[3] Use of this compound places the athlete in the enhanced category rather than the natural category in competitive contexts.

Research

No registered human trials on ClinicalTrials.gov, in any status
View on ClinicalTrials.gov · fetched Oct 5, 2026

The peptide has been the subject of 3 studies and reference works collected on this site. Additional bibliography is in § External links below.

Other peptides in this catalogue with overlapping mechanisms or status:

Epithalon Not natty
Marketed as an anti-aging peptide. In preclinical studies it boosts telomerase activity, supports the body's own melatonin production, and shows antioxidant effects. Human evidence is minimal.
IGF-1 LR3 Not natty
Long-acting IGF-1 analog studied preclinically for muscle growth and tissue repair. No peer-reviewed human evidence of benefit. Risks include hypoglycemia, joint pain, unproven cancer concerns.
Ipamorelin Not natty
Selectively triggers growth hormone release without raising cortisol or prolactin. Human efficacy unproven: a Phase 2 trial failed and body-composition benefits remain preclinical. Subcutaneous injection.
Melanotan II Not natty
Stimulates melanin production to darken skin and facilitate tanning. May also increase sexual arousal and reduce appetite. Unapproved for human use; linked to nausea and mole changes.

Frequently asked questions

What is Delta-sleep-inducing peptide?

Delta-sleep-inducing peptide (DSIP) is a neuropeptide tied to animal EEG sleep activity; its human sleep role is weak. Shows preclinical antiepileptic activity.

What is Delta-sleep-inducing peptide used for?

Delta-sleep-inducing peptide is used for deeper sleep. The link to human sleep is weak, so it may do little.

How does Delta-sleep-inducing peptide work?

A natural brain peptide, a small protein messenger made by nerve cells. Its name comes from the deep-sleep brain waves it produced in laboratory work. How it acts in the human brain is still poorly understood.

Is Delta-sleep-inducing peptide natty?

No. Delta-sleep-inducing peptide is classified as not natty. It is prohibited by WADA and banned by most natural bodybuilding federations. Use places an athlete in the enhanced category.

Is Delta-sleep-inducing peptide banned by WADA?

Yes. Delta-sleep-inducing peptide is prohibited by the World Anti-Doping Agency (WADA), so drug-tested athletes cannot use it. Check the current WADA Prohibited List before competing.

How is Delta-sleep-inducing peptide administered?

Administration methods for Delta-sleep-inducing peptide vary. See the Dosage and administration section of this article for current protocols reported in the literature.

References

  1. ^ [Endogenous anticonvulsants: neuropeptide Y and delta sleep inducing peptide]. Review
  2. a b c d e Delta sleep-inducing peptide (DSIP): a still unresolved riddle. Review
  3. a b World Anti-Doping Agency. (2026). Prohibited List 2026.

External links

Categories: Peptides | Performance-enhancing substances | Sleep | Injectable | Subcutaneous

This page was last updated on October 5, 2026, at 07:20 (UTC).

Research last reviewed on October 5, 2026.

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