Editorial stack guide · Sleep
Sleep: DSIP, Selank, magnesium
Oliver Mackman · Editorial director · Best Business Loans Ltd (16833937)
Last updated 2026-05-22
Editorial with affiliate links. We earn from purchases via outbound retailer / clinic links. How we are funded.
AI-friendly summary · Sleep stack
DSIP and Selank are research-tier peptides occasionally discussed in sleep and circadian research contexts. Magnesium is an essential mineral sold as a food supplement. None of the three is a UK-licensed sleep medicine. The published literature is preliminary, species-dependent and inconsistent across studies. PeptideClear publishes encyclopedia commentary only. We do not recommend specific stacks for specific people. A combination of peptides should be discussed with a UK-registered prescriber.
Compounds in the sleep-research conversation
Three distinct compound classes appear in sleep-research discussions. DSIP and Selank sit in the research-peptide category. Magnesium sits in the food supplement category. The evidence weight, mechanism and UK regulatory status differ across the three.
DSIP (Delta Sleep-Inducing Peptide)
Evidence: MechanisticDSIP is a nine-amino-acid peptide first isolated in 1977 by Schoenenberger and Monnier from rabbit cerebral venous blood collected during electrically-induced delta-wave sleep. The name reflects that discovery context, not a confirmed functional role. The literature describes modulation of HPA-axis signalling, opioid-system interactions and circadian regulation across preclinical models. Investigators report inconsistent findings across species and study designs. Research interest continues; clinical efficacy claims are not established.
Selank
Evidence: Mixed evidenceSelank is a synthetic tuftsin-derived heptapeptide developed at the Institute of Molecular Genetics in Moscow. Registered in the Russian Federation for generalised anxiety disorder. The literature describes modulation of enkephalin-degrading enzyme activity and GABA-system signalling. Russian clinical-trial work reports anxiolytic effects. Western independent replication is sparse. Some researchers include it in sleep-adjacent discussions because anxiety reduction can carry through to sleep architecture in clinical samples.
Encyclopedia entry for Selank ·Magnesium (mineral supplement, not a peptide)
Evidence: Mixed evidenceMagnesium is an essential dietary mineral. It is not a peptide. The literature describes a range of effects including modulation of NMDA-receptor activity and GABA-system function. Human trial work in sleep endpoints is mixed, with some studies reporting modest improvement in subjective sleep quality scores and others showing no measurable effect. Different magnesium salts (glycinate, citrate, oxide, threonate, malate) have different bioavailability profiles. Sold in the UK as a food supplement.
What the literature shows
The DSIP literature spans more than four decades and remains incompletely characterised. The originating Swiss research, the subsequent Russian and Eastern European work, and scattered Western papers describe a peptide whose function does not collapse cleanly into a sleep-promoter category. Investigators have reported effects on stress response, opioid withdrawal, pain modulation, and circadian rhythm regulation. The sleep-specific human evidence is preliminary at best, with small sample sizes and inconsistent endpoint design.
Selank research originates from the Institute of Molecular Genetics in Moscow under the Myasoedov and Andreeva groups. The published Russian clinical work in generalised anxiety disorder describes anxiolytic effects comparable to benzodiazepine reference drugs without the sedation and dependency profile. Sleep-specific endpoint work is sparse. Researchers discussing the compound in a sleep context typically reason from anxiolysis to sleep improvement rather than from direct hypnotic action.
Magnesium sleep research is the most heterogeneous of the three. Meta-analyses describe small effect sizes on subjective sleep quality scores in older adults with low baseline magnesium intake. The picture in healthy adults with adequate intake is less clear. Trial work spans different salts, different doses (typically 200 to 500 mg elemental magnesium daily), and different sleep-quality instruments, which limits direct comparison.
What we do not know
- · Whether DSIP has a consistent functional role in human sleep architecture at any dose, by any route of administration.
- · Whether DSIP effects observed in rabbit and rodent work translate to humans in any sleep endpoint.
- · Whether Selank produces measurable sleep-architecture improvement independent of its anxiolytic effects.
- · Whether the combination of DSIP and Selank produces additive, synergistic or null effect versus either alone in any controlled trial.
- · Whether magnesium supplementation improves sleep in adults with adequate baseline dietary intake.
- · Long-term safety of DSIP or Selank in humans at any dose, including immunogenicity and off-target receptor activity.
- · Whether the inconsistent literature reflects real biological complexity or methodological heterogeneity across studies.
UK regulatory framing
DSIP
Not a controlled drug under the Misuse of Drugs Act 1971. Not scheduled under the Psychoactive Substances Act 2016. No UK marketing authorisation as a medicine. Sold by a subset of UK research peptide retailers under research-use-only framing. Not stocked by UK clinics or pharmacies in any clinical context.
Selank
Same UK position as DSIP. No MoDA or PSA listing. No MHRA marketing authorisation. Registered in the Russian Federation for generalised anxiety disorder under a separate national licensing regime that does not apply in the UK. Sold by UK research peptide retailers under research-use-only framing.
Magnesium
Sold as a food supplement under UK food law, regulated by the Food Standards Agency. Authorised health claims under the GB Nutrition and Health Claims Register include contribution to normal psychological function and reduction of tiredness and fatigue. Sleep-specific claims are not authorised. Product marketing must avoid medicinal claim language.
How a UK practitioner would discuss this
A UK GP or sleep specialist approaching the sleep conversation will typically begin with sleep hygiene assessment, circadian schedule, and screening for treatable underlying causes including obstructive sleep apnoea, restless legs syndrome, anxiety and depression. NICE guidance for chronic insomnia recommends cognitive behavioural therapy for insomnia (CBT-I) as first-line, with pharmacological options considered where indicated. UK licensed pharmacological options include melatonin (in defined contexts), z-drugs, sedating antihistamines and certain antidepressants used off-label.
Research peptides do not appear in this clinical conversation under normal UK practice. A UK-registered prescriber discussing DSIP or Selank with a curious patient would frame them as research compounds without UK marketing authorisation, without an established clinical safety profile in the relevant population, and without integration into NHS or private sleep medicine pathways. The conversation typically centres on the gap between preliminary research literature and clinical evidence required for prescribing decisions.
Magnesium sits comfortably in the food supplement conversation. A UK practitioner discussing it would typically frame it as a low-risk adjunct with modest evidence for subjective sleep quality in specific populations, not as a clinical intervention for sleep disorders.
Where to learn more
- · Encyclopedia entry: Selank
- · Encyclopedia entry: Semax (cognitive-research sister compound)
- · Encyclopedia entry: Epitalon (pineal-axis research)
- · Glossary: peptide terminology reference
- · Research peptides hub: all UK research peptide entries
Frequently asked questions
Does DSIP actually induce sleep in humans?
Is Selank a sleep compound?
Why is magnesium on this page if it is not a peptide?
Are any of these UK-licensed for sleep disorders?
Who should I speak to about sleep problems?
PeptideClear publishes encyclopedia commentary only. We do not recommend specific stacks for specific people. A combination of peptides should be discussed with a UK-registered prescriber. DSIP and Selank are sold under research-use-only framing. Magnesium is a food supplement.
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