A naturally occurring neuropeptide that promotes deep restorative sleep and modulates stress hormone responses.
Delta Sleep-Inducing Peptide (DSIP) is a naturally occurring nonapeptide (9 amino acids: Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) first isolated in 1977 from the cerebral venous blood of rabbits by Monnier and colleagues at the University of Basel. It is found endogenously in the hypothalamus, pituitary, and limbic system, as well as in peripheral tissues including the adrenal gland and gut. DSIP promotes slow-wave (delta) sleep, reduces stress-induced ACTH and cortisol release, has demonstrated analgesic properties, and exhibits antioxidant activity. Research has also explored its potential in managing withdrawal symptoms from alcohol and opioids, and in reducing pain in chronic pain syndromes. Its amphiphilic structure allows it to cross the blood-brain barrier, which is unusual for a peptide of its size.
* Benefits based on preclinical/animal research unless otherwise noted.
DSIP modulates the hypothalamic-pituitary-adrenal (HPA) axis by reducing the release of ACTH from the anterior pituitary and subsequently lowering cortisol secretion under stress conditions. Its sleep-promoting effects are mediated through modulation of GABAergic neurotransmission — enhancing the inhibitory tone that promotes slow-wave sleep — as well as through serotonergic pathways. DSIP also appears to inhibit somatostatin (growth hormone-inhibiting hormone) release, which may contribute to nocturnal GH secretion during deep sleep. Its antioxidant properties involve scavenging of reactive oxygen species (ROS) and upregulation of endogenous antioxidant enzymes. At the cellular level, DSIP has been shown to modulate mitochondrial function and reduce oxidative damage, which may underlie its reported neuroprotective effects.
Protocol Notes: Administer 30–60 minutes before sleep. Can be used nightly or as needed. Some users report vivid dreams initially.
Add 2 mL bacteriostatic water to 2 mg vial → 1000 mcg/mL For 200 mcg dose: draw 0.2 mL (20 units on U-100 syringe)
When sourcing DSIP for research purposes, the following quality benchmarks should be verified before use.
Lyophilized: refrigerate. Reconstituted: refrigerate and use within 14 days.
The statements made within this website have not been evaluated by the US Food and Drug Administration. The products and information provided are not intended to diagnose, treat, cure, or prevent any disease. This website is intended for educational and research purposes only. Many peptides described on this site are not approved by the FDA for human therapeutic use and are classified as research chemicals. Nothing on this site constitutes medical advice.
Limited Evidence — Primarily animal studies with limited human data. Mechanism is plausible but clinical efficacy is unconfirmed.
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