COGNITIVE & NOOTROPIC RESEARCH / FAQ
Questions From the Research Record
Direct, citation-anchored answers to the questions readers most often bring to Semax, Selank, and DSIP.
What is Semax?
Semax is a synthetic heptapeptide (H-Met-Glu-His-Phe-Pro-Gly-Pro-OH) built from a fragment of adrenocorticotropic hormone (ACTH) with a stabilizing Pro-Gly-Pro tail added to slow its breakdown. It lacks the cortisol-releasing activity of full ACTH and is studied instead for effects on neurotrophin signaling and neuroprotection. It is registered as a prescription drug in Russia and Ukraine and sold as a research chemical elsewhere, including the United States.
What is Semax peptide used for?
In the research literature, Semax has been studied for neuroprotection after stroke and spinal-cord injury, for upregulating the neurotrophins BDNF and NGF, and for cognitive and antiamnesic (memory-preserving) effects in rodent ischemia models [1][2][3][4][5]. It is used clinically in Russia for ischemic stroke, transient ischemic attack, cognitive impairment, and optic-nerve disease. It has no approved use in the United States and this site names no human protocol for it.
Is Semax a peptide?
Yes. Semax is a synthetic heptapeptide — a chain of seven amino acids — built from a fragment of ACTH combined with a Pro-Gly-Pro stabilizing tripeptide. It is not a hormone, a stimulant, or a small-molecule drug; it is classified in the literature as a neuropeptide and as a synthetic ACTH(4-10) analog.
How does Semax work?
Semax rapidly and region-specifically upregulates the neurotrophins BDNF and NGF in the brain and increases BDNF protein in the basal forebrain, acting through a specific, reversible, calcium-dependent binding site with a dissociation constant of 2.4 nanomolar [4]. It also inhibits enzymes that degrade the body's own opioid-like peptides. In cerebral-ischemia models, its protective effect is described as driven largely by shifts in immune- and vascular-system gene expression rather than a single receptor pathway [2].
What is Selank?
Selank is a synthetic heptapeptide (Thr-Lys-Pro-Arg-Pro-Gly-Pro) built from tuftsin, a naturally occurring immune-system tetrapeptide, extended with the same Pro-Gly-Pro stabilizing tail used in Semax. It is studied primarily as a non-benzodiazepine anxiolytic and is registered as such in Russia; it has no FDA or EMA approval and is sold in the US as a research chemical.
What does Selank do?
In animal and limited human research, Selank reduces anxiety-like behavior through positive allosteric modulation of GABA receptors and inhibition of enkephalin-degrading enzymes, distinct from benzodiazepine sedation [6]. It also alters serotonin and dopamine turnover, modulates hippocampal BDNF expression, and — inherited from its tuftsin origin — shifts the immune system's Th1/Th2 cytokine balance in patients with anxiety-asthenic disorders [10].
What is Selank peptide used for?
Selank has been studied for reducing anxiety-like behavior in stress models, including in combination with diazepam, where the pairing was the most effective intervention tested in one rat study [7]. It has also been studied for effects on hippocampal BDNF expression via intranasal dosing [9] and, in a small human study, for modulating immune markers in patients with anxiety-asthenic disorders [10]. It is not approved for any use in the United States.
How does Selank work?
Selank acts primarily through positive allosteric modulation of GABA receptors, enhancing GABA's own binding rather than acting at a benzodiazepine site, and it shifts GABA-pathway gene expression in a direction that correlates with GABA's own effects [6][8]. A second mechanism — inhibition of enzymes that break down endogenous opioid-like peptides — is thought to contribute to its anxiolytic profile alongside effects on serotonin, dopamine, and BDNF signaling.
What is DSIP peptide?
DSIP, Delta Sleep-Inducing Peptide, is an endogenous nonapeptide (Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu) first isolated from the cerebral venous blood of sleeping rabbits in 1977 [16]. Despite the name, no specific DSIP receptor, gene, or precursor protein has ever been identified, and a 2006 review described the evidence for its signature sleep-promoting effect as "extremely poorly documented and still weak" [12]. It is not approved as a drug anywhere and is sold in the US as a research chemical.
What is DSIP peptide used for?
In the research literature, DSIP has been studied for promoting slow-wave (delta) sleep, for reducing plasma ACTH-like activity in men [14], for improving sleep quality in a small trial of chronic insomniacs [15], for motor-function recovery after stroke in rats when given intranasally [17], and — in a single lineage of Russian studies using the DSIP-containing preparation Deltaran — for lifespan and tumor-incidence effects in mice [13]. None of these are human-use recommendations.
What are the benefits of DSIP peptide?
In cited studies, DSIP-related findings include modestly improved sleep quality and reduced disruption in a small human insomnia trial [15], improved post-stroke motor-function recovery in rats given the peptide intranasally [17], and — from a single Russian research lineage — increased maximum lifespan and reduced tumor incidence in mice given a DSIP-containing preparation [13]. Community reports (anecdotal, not clinical evidence) most often describe an easier transition into sleep and, for people who dream vividly on it, more memorable dreams. A large share of people report no effect at all.
Does DSIP really work?
The honest answer from the literature is: inconsistently. A 2006 review calling DSIP's sleep-promoting evidence "extremely poorly documented and still weak" remains the most comprehensive assessment of the compound [12], and even the positive human insomnia trial was small (six participants) and decades old [15]. A large share of community reports describe no noticeable effect, with one commonly repeated estimate putting the response rate at roughly half of people who try it. A 2024 study using an engineered blood-brain-barrier-crossing fusion of DSIP showed clearer effects than native DSIP in mice [11], which is itself evidence that unmodified DSIP's own effect is limited.