- Selank and Semax are Russian-developed neuropeptides studied in anxiety and cognition models, but their human data is limited and, across the indexed literature, none of it reported outcomes by sex.
- DSIP is studied for sleep-architecture and HPA-axis signaling in preclinical systems, with no controlled human trials in women indexed for anxiety or mood endpoints.
- For all three compounds, many studies included female subjects yet no sex-stratified outcomes were reported, so the female evidence is effectively unstudied.
Search for a calmer mind and the same short list of peptides keeps surfacing: Selank, Semax, and DSIP. They cluster in the anxiety, mood, and sleep conversation, often presented as gentler alternatives to conventional options. The mechanisms are real research questions, and the compounds have a genuine literature. What that literature does not have, on close reading, is much human data, and almost none of it broken out by sex. This page separates the studied mechanisms from the claims, and is explicit about the female gap.
Selank: a tuftsin analog for anxiolytic models
Selank is a synthetic heptapeptide analog of tuftsin, an immunomodulatory peptide, developed as a stabilized research material. In preclinical systems it has been studied for its influence on GABAergic signaling, brain-derived neurotrophic factor (BDNF) expression, monoamine balance, and enkephalin-degradation pathways, the mix of targets that puts it in anxiolytic and cognition research. Human data with Selank remains limited, and it is frequently studied alongside Semax.
Semax: an ACTH fragment in neuroscience research
Semax is a synthetic analogue of the ACTH fragment 4-10, developed in Russia in the 1980s. In preclinical models it has been studied for its relationship to BDNF and nerve-growth-factor expression and to dopaminergic and serotonergic signaling. Compared with Selank, its studied mechanism is relatively specific, characterized against defined pathways rather than acting broadly across receptor classes. Most human research comes from a small number of studies.
DSIP: sleep and stress-axis signaling
DSIP, delta sleep-inducing peptide, is a naturally occurring nonapeptide first identified in studies of sleep-related neurochemistry. In preclinical and in-vitro systems it has been studied for its modulatory relationship to sleep-architecture models, hypothalamic-pituitary-adrenal (HPA) axis signaling, neurotransmitter balance, and stress-response pathways. Because sleep and stress physiology are tightly linked, DSIP sits at the edge of the same mood conversation, though its indexed work is largely mechanistic.
The female data gap
The pattern across all three is consistent and worth stating plainly. For Selank and Semax, there is no menstrual-cycle interaction data, no pregnancy or lactation safety data, no hormonal-interaction data, and no data in perimenopausal or menopausal populations. Many studies included female subjects, but none reported outcomes by sex. DSIP's human record for anxiety and mood endpoints is thinner still. In this database's terms, the female evidence for these compounds is unstudied, a first-class, honest state, not a blank waiting to be filled with plausible-sounding extrapolation.
Some early studies report dose ranges for these compounds; none has an established therapeutic dose in most jurisdictions. Anything reported in the literature is research context only. This site does not publish personal dosing, protocols, or medical advice, and none of this is a substitute for care from a clinician.
Persistent anxiety and mood changes are worth taking to a healthcare professional. Research-use peptides are not treatments for anxiety or any mental-health condition, and this page makes no such claim.
The calm-and-focus framing around these peptides runs well ahead of the human evidence, and that evidence, where it exists, was almost never analyzed in women. That is the honest map. For the full per-compound record of what was studied and in whom, see the Selank, Semax, and DSIP profiles, and for a closer look at the two most-compared members, the Selank vs Semax comparison.