DSIP

Fifty years of study, still no agreed mechanism. A gentle sleep modulator, not a sedative.

Evidence: DCommunity use what's this?
Grade D for use. Human data exist but are old, small and mixed.
Also known as: Delta Sleep-Inducing Peptide · Emideltide
Class: Naturally occurring nonapeptide; sleep and stress modulator

The 30-second version

WhatA nine-amino-acid peptide first isolated in the 1970s from the blood of sleeping rabbits.

Why people use itDeeper sleep and stress buffering, especially when sleep is disrupted.

The honest catchIt works best when sleep is already off, barely affects good sleepers, and more can do less.

What it is

Swiss researchers named DSIP for its apparent effect: inducing delta-wave (deep, slow-wave) sleep. It occurs naturally in the brain, spinal fluid, blood and breast milk. It has been linked to sleep, stress, mood, withdrawal and cell protection, yet it’s studied more than almost any peptide here and understood less. It isn’t approved anywhere.

How it seems to work

No single receptor. The mechanism is genuinely unresolved.

Stress axis. Blunts the cortisol and ACTH spike from a stressor without shutting cortisol down.

Sleep modulator. Nudges disturbed sleep back toward normal rather than forcing sedation.

Delayed effect. A daytime dose can improve that night’s sleep, and several nights after.

U-shaped. There’s an optimal dose. Higher can work less well.

It’s thought to interact with NMDA and GABA signalling. Because evening cortisol often keeps people awake, calming the stress axis may be part of how it helps sleep.

What the research shows

In people: studies since the late 1970s showed effects on sleep architecture, better in disturbed sleepers and minimal in good ones². It blunted the cortisol and ACTH response to stress¹. Small, often uncontrolled pilots reported milder opiate withdrawal. No large modern randomised trial exists. In animals: broad. It promoted delta sleep in rabbits, rats and mice, and showed anti-stress, antioxidant, anticonvulsant and neuroprotective effects.

Someone expecting a sleeping pill will be underwhelmed. Any benefit shows as gradually better nights.

Evidence at a glance

Use	Grade	Best evidence	Main gap	Read
Disturbed sleep	BHuman trials	Modulates sleep; better when disturbed²	Old, small, mixed	Gentle modulator
Stress buffering	BHuman trials	Blunts cortisol/ACTH response¹	Dated	Real signal
Opiate withdrawal	BHuman trials	Reduced severity in pilots	Small, uncontrolled	Preliminary
Neuroprotection	ELab & animal	Animal models	Animal only	Speculative

Dosing: what has been reported

Not a recommendation. These figures describe what was studied or what circulates in practice, kept separate so you can see how solid each one is. Speak with a qualified clinician before acting on any of it.

Setting	Figure	Route	Grade
Published human (dated)	~25 nmol/kg IV, roughly a couple of hundred mcg, in clinic²	IV	B
Community	100–300 mcg, as needed, 30–60 min before bed or during the day	Subcutaneous	D

No fasting needed. Because of the U-shaped response, the low-to-middle of the range often works better than the top.

Preparing & storing

Reconstitute with bacteriostatic water and refrigerate. No unusual handling quirks.

Reported side effects

Occasional mild headache
Grogginess at higher doses
Uncommon mild dizziness; injection-site redness
Less effect at high doses (the U-curve)

The old human studies reported no major adverse effects. Track sleep quality and stress subjectively.

Who should avoid it

Pregnancy and breastfeeding
Sleep, sedative or psychiatric medication: get medical input first
Anyone expecting a strong sedative

Regulatory status checked Oct 2026

Body	Status	Detail
FDA (US)	Not approved	Never approved despite decades of study.
EMA (EU)	Not approved	—
CDSCO (India)	Not approved	—
WADA	Not named	S0 could apply.

The NexGen read

Subtle, old and unsolved

DSIP has a real but dated human signal for disturbed sleep and stress. It’s well tolerated and gentle, and genuinely mysterious. Use the lower end of the range and judge it over a week of nights, not one.

References

Graf MV, Kastin AJ. Delta-sleep-inducing peptide (DSIP): a review. Neurosci Biobehav Rev. 1984;8(1):83–93. PMID 6145137
Delta sleep-inducing peptide. Eur J Anaesthesiol. 2001;18(7):427–440. (Review of its sleep-promoting rather than sedative profile.)