DSIP
Delta Sleep-Inducing Peptide
DSIP (Delta Sleep-Inducing Peptide) is an endogenous neuropeptide originally isolated from rabbit cerebral venous blood in 1977, consisting of 9 amino acids (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu). It is primarily researched for its ability to promote slow-wave (delta) sleep, reduce stress responses, and modulate the hypothalamic-pituitary axis, with secondary interest in its anxiolytic, analgesic, and antioxidant properties.
Mechanism of Action
DSIP appears to act on multiple central and peripheral targets, including modulation of GABA-ergic and opioidergic neurotransmission, which may underlie its sleep-promoting and anxiolytic effects. It influences the hypothalamic-pituitary axis by modulating corticotropin (ACTH) and LH release, and has been shown to reduce basal corticosterone levels, suggesting a role in attenuating HPA axis hyperactivity. DSIP also exhibits antioxidant properties and may stabilize cellular redox status, potentially contributing to its reported neuroprotective and anti-aging effects in preclinical models.
Evidence by Health Goal(13 goals)
Dosing Protocols
30-60 minutes before bed
Cycle: 2-4 weeks on, 2 weeks off
Subcutaneous injection is most commonly used. Reconstitute lyophilized powder with bacteriostatic water. Start at the lower end of the dosing range (100-200mcg) to assess tolerance. Some protocols use 3-5 consecutive nights rather than daily continuous use.
30-60 minutes before bed
Cycle: 2-4 weeks on, 2 weeks off
Intranasal administration is an alternative to injection with less evidence of bioavailability equivalence. Requires a nasal spray formulation. Bioavailability may be lower and less consistent than subcutaneous injection.
Safety & Side Effects
DSIP has a generally favorable short-term safety profile in the limited human studies available, with no serious adverse events reported at typical research doses; however, long-term safety data in humans is sparse and it remains an unregulated research peptide without approved clinical indications in most countries. Users should exercise caution given the lack of large-scale human trials, and it should not be used by pregnant or breastfeeding individuals or those with significant cardiovascular, endocrine, or neurological conditions without medical supervision.
Possible Side Effects
- !Morning grogginess or sedation carry-over if dose is too high
- !Mild headache, particularly at higher doses or during initial use
- !Transient hypotension or lightheadedness upon standing
- !Injection site redness, itching, or mild irritation (subcutaneous route)
- !Vivid dreams or changes in dream recall
- !Nausea at higher doses
- !Potential tolerance development with prolonged continuous use
Interactions
- -May potentiate the sedative effects of benzodiazepines, Z-drugs (zolpidem, zopiclone), and other CNS depressants — combination should be avoided or used with caution
- -Additive hypotensive effects possible when combined with antihypertensive medications
- -May interact with corticosteroid therapy due to HPA axis modulation — use caution in individuals on exogenous glucocorticoids
- -Theoretical interaction with opioid medications due to modulation of opioidergic pathways — monitor for enhanced sedation
- -May amplify effects of other sleep-promoting supplements such as melatonin, magnesium glycinate, or valerian root
Cost & Where to Buy
Typically sold as lyophilized powder in 2-5mg vials from research peptide vendors. Monthly cost depends on dose frequency and vial size purchased; bulk purchasing reduces per-dose cost. Purity and vendor quality vary significantly — third-party tested sources cost more but are recommended.