Verified July 2026 · Cited to primary sources
DSIP (Delta Sleep-Inducing Peptide): Evidence Grade D. Animal studies only, unproven in humans.
The honest verdict
DSIP is one of the oldest sleep peptides and one of the least resolved. There are genuine small human studies suggesting it helped insomnia, which is more than most research peptides can claim, but the evidence is thin, decades old, and never replicated at modern standards, and the basic biology is still contested. Interesting history, weak proof. If you try it you are running a personal experiment on 1980s data.
DSIP (Delta Sleep-Inducing Peptide) at a glance
- Class
- Neuropeptide (nonapeptide)
- Mechanism
- DSIP is a naturally occurring nonapeptide first isolated from rabbit brain during electrically induced sleep. It was proposed to promote delta-wave (slow-wave) sleep and to modulate stress, temperature, and pain, but its receptor, gene, and even its status as a true endogenous sleep factor have never been firmly established. The mechanism remains largely uncharacterized.
- Also known as
- Delta Sleep-Inducing Peptide, DSIP, delta-sleep inducing peptide
- Research applications
- Insomnia and sleep normalization
- Circadian / phase-shift sleep disorders
- Stress and pain modulation
- Alcohol and opioid withdrawal (older exploratory work)
- Forms
- Subcutaneous injection (research), Intravenous infusion (used in the original human studies)
- Legal status
- Research-only
- WADA (anti-doping)
- Not specifically named on the WADA Prohibited List.
- Evidence grade
- Grade DAnimal studies only, unproven in humans
How we grade evidence
Every grade comes from a fixed A to F rubric: human-trial strength, not hype or affiliate status. Last verified July 6, 2026.
What is DSIP (Delta Sleep-Inducing Peptide)?
A nine-amino-acid peptide discovered in the 1970s and named for the deep-sleep brain waves it was thought to trigger. Small old human studies suggested it helped insomnia, but the underlying science stayed so thin that reviewers literally call it an unresolved riddle.
DSIP is a naturally occurring nonapeptide first isolated from rabbit brain during electrically induced sleep. It was proposed to promote delta-wave (slow-wave) sleep and to modulate stress, temperature, and pain, but its receptor, gene, and even its status as a true endogenous sleep factor have never been firmly established. The mechanism remains largely uncharacterized.
How strong is the evidence for DSIP (Delta Sleep-Inducing Peptide)?
DSIP does have human data, but it is old, small, and thin. The clinical work is from the late 1970s and 1980s: double-blind crossover infusions in six normal volunteers showing increased sleep, and open studies in a handful of severe insomniacs reporting normalized sleep. These are tiny samples, mostly uncontrolled or minimally controlled, using intravenous dosing that does not match how people use it today. A 2006 review concluded the hypothesis that DSIP is a sleep factor is extremely poorly documented and still weak, and that the peptide's natural occurrence and activity remain obscure. That combination, a few thin decades-old human signals with no modern confirmation, lands it at D rather than C.
Primary sources (3)
- Schneider-Helmert et al. 1981, Int J Clin Pharmacol Ther Toxicol - Acute and delayed effects of DSIP on human sleep behavior (double-blind crossover, six normal volunteers; sleep increased ~59% after IV DSIP vs placebo)
- Kaeser 1984, Eur Neurol - A clinical trial with DSIP (open study, seven patients with severe insomnia; sleep reported normalized for 3-7 months in all but one)
- Kovalzon & Strekalova 2006, J Neurochem - Delta sleep-inducing peptide (DSIP): a still unresolved riddle (review concluding the sleep-factor hypothesis is poorly documented and weak)
Is DSIP (Delta Sleep-Inducing Peptide) legal? (Status July 2026)
No legal supervised US route.
What is DSIP (Delta Sleep-Inducing Peptide) used for?
DSIP (Delta Sleep-Inducing Peptide) is marketed for the goals below. See how it ranks against other peptides in each, by evidence, not hype.
What does DSIP (Delta Sleep-Inducing Peptide) cost, and how do you access it legally?
Typical cost
$30 to $70 per 5 mg vial from research suppliers
Cheap by peptide standards, but you are buying a compound whose sleep effect rests on a few small studies from the 1980s and a mechanism that reviewers say was never properly established.
No legal supervised access route right now.
DSIP (Delta Sleep-Inducing Peptide) has no compliant US route today. Vials sold "for research use only" are a gray-market fig-leaf, not a legal loophole, so we don't link them. If you pursue DSIP (Delta Sleep-Inducing Peptide), do it with a licensed clinician, and re-check its legal status first.
Is DSIP (Delta Sleep-Inducing Peptide)safe? Side effects & risks
In the small old human studies DSIP was reported to cause no daytime sedation and no notable side effects, but the total number of people ever studied is tiny and modern safety, purity, and long-term data simply do not exist. It is sold as a research chemical, not a medicine. Note: DSIP appears in FDA compounding-status discussion but it is not one of the peptides on the July 2026 PCAC docket. Anyone using injectable research-grade DSIP for sleep is relying on 40-year-old evidence.
Medical disclaimer: This page is independent editorial information, not medical advice, and Best Peptide For That is not a medical provider. We do not provide dosing. Talk to a licensed clinician before starting, stopping, or changing any peptide or medication. Full medical disclaimer.
FAQ
DSIP (Delta Sleep-Inducing Peptide) FAQ
Does DSIP actually help you sleep?
Small human studies from the late 1970s and 1980s suggested it increased sleep and helped some insomniacs, but the samples were tiny, the studies old, and none have been replicated at modern standards. The honest answer is that the evidence is suggestive but weak.
Is DSIP FDA approved?
No. DSIP is not an approved drug anywhere. It is sold only as a research chemical and is discussed in FDA compounding contexts, but it is not one of the peptides on the July 2026 PCAC review docket.
Is DSIP safe?
The old human studies reported no significant side effects and no daytime sedation, but very few people have ever been studied and there is no modern safety or purity data. Research-grade material is unregulated.
Why is the evidence for DSIP called a riddle?
Because after decades of study, its receptor and gene were never firmly identified, and reviewers concluded the idea that it is a genuine sleep factor is poorly documented. The sleep effects were observed, but the biology behind them was never nailed down.
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