Nootropics & cognitive
DSIP
A short peptide first isolated from the brains of sleeping rabbits, explored for sleep, stress and pain modulation. Human evidence for an actual sleep-inducing effect is thin, despite the name.
Research chemical Nootropics & cognitive
- Full name
- Delta Sleep-Inducing Peptide
- Also known as
- DSIP
- Regulatory status
- Research chemical, no clinical approval anywhere. Human trial data is sparse and dated.
Origin
First isolated in 1977 from rabbit blood during electrically induced slow-wave (delta) sleep, hence the name. Later research found DSIP has a wider range of physiologic and endocrine roles than sleep induction alone.
Mechanism
Proposed to modulate ACTH levels, inhibit somatostatin secretion (relevant to GH-release timing, since somatostatin blocks GH release), normalize blood pressure, and alter pain perception, alongside its namesake but weakly proven role in delta-wave sleep.
Research summary
Evidence
The human evidence that DSIP reliably induces or deepens delta-wave sleep is older and weaker than most people assume. Studies from the 1970s-80s produced mixed results, and no rigorous, modern, large-scale human sleep trial has followed. Most claims in wellness/peptide marketing trace back to this limited older literature.
Evidence tier: Research chemical — see the methodology note for how this is assessed.
Citations
- Delta Sleep-Inducing Peptide Recovers Motor Function in SD Rats after Focal Stroke — Tukhovskaya et al. 2021
- DSIP-Like KND Peptide Reduces Brain Infarction in C57Bl/6 and Reduces Myocardial Infarction in SD Rats When Administered during Reperfusion — Tukhovskaya et al. 2021
- Secreted peptides crossing the blood-brain barrier and DSIP fusion peptide efficacy in PCPA-induced insomnia mouse models — Mu et al. 2024
- Phosphorylated delta sleep inducing peptide restores spatial memory and p-CREB expression by improving sleep architecture at high altitude — Roy et al. 2018
Reported benefits
- Reported improvement in sleep onset or depth by some users, though response is described as inconsistent between individuals
- Reported reduction in stress reactivity
- Sometimes included in stacks with Epithalon for a broader 'sleep and recovery' framing
Dosing protocols reported in the literature & community
These are protocols reported by compounding pharmacies, published trials, or self-experimentation communities — not a prescription. Start low, especially for anything new.
| Route | Reported protocol |
|---|---|
| Subcutaneous injection, before bed | Commonly reported doses are 100-300 mcg, injected 30-60 minutes before intended sleep; given inconsistent reported response, many users treat it as worth a short trial period rather than an assumed-effective compound. |
Side effects
- Generally reported as well tolerated at typical self-administered doses
- Limited modern human safety data
Safety notes
Community & reddit notes (anecdotal — not clinical evidence)
A lower-confidence addition to sleep/recovery stacks. Discussed less often and with more mixed reviews than the GH secretagogues or Epithalon.
Related peptides
Mixing compatibility
Pulled from a community-charted mixing-compatibility reference (anecdotal, clinic-use, and community-reported signals) — not a safety guarantee. Verify independently before combining anything.