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Named for an effect, not a mechanism
DSIP was isolated from the blood of rabbits induced into a sleep-like state, and named after the sleep stage the researchers connected it to. Naming a molecule after an observed effect was normal practice at the time; it also locks in an interpretation before the mechanism is understood.
Half a century later the mechanism is still not established. There is no confirmed receptor and no agreed account of how the peptide would produce the effect its name asserts.
The name is the first thing to unpack: what is DSIP resolves to delta sleep-inducing peptide, a label that asserts an effect the literature has never firmly established. That distance between the name and the evidence is the whole story of the compound.
Mechanism
A field that never grew
Research activity peaked relatively early and then thinned out. Some work looked at stress-response markers and pain thresholds alongside the sleep question, but replication has been limited and no sustained programme developed.
Silence in a field means nobody carried the work forward, which is different from somebody disproving it and different again from somebody confirming it. The confident summaries circulating online are, almost without exception, retellings of the same handful of old papers.
It is worth being precise about what a quiet field leaves behind. There is no body of negative results here to weigh against the positive ones, because the studies that would have produced them were never run, and an absence of contradiction reads far more like support than it should. Neighbours from the same tradition show the pattern too, selank carries a confident reputation over a similarly small record.
At a glance
| Length | 9 amino acids |
| Isolated | From rabbit blood, 1970s |
| Named after | The sleep stage associated with it |
| Receptor | Not established |
| Format | Nasal spray |
| Purity | ≥ 99% (HPLC) |
| Evidence base | Small and largely historical |
| Category | Research use only |
Release specification. Any effect claim you have read elsewhere is not supported here.
In practice
Nine residues, and the nasal route
At nine amino acids DSIP is short enough for the mucosal route to be worth investigating, which is why it appears in the catalogue as a spray rather than a pen.
That is the same reason the other sprays here are all short sequences. Chain length, not preference, decides which formats are worth offering.
How small the primary literature is becomes clear the moment you pull it up through the record on PubMed: a handful of papers, most of them decades old, and a long tail of citations pointing back at them. Whether the mucosal route suits a given question is a separate matter, set out in the nasal spray versus injection comparison.
Reading an old literature
What a missing receptor does to a research field
A confirmed receptor gives a field somewhere to go: binding studies, structure work, analogues designed against a target. DSIP never had one, and that absence is a large part of why the thread was dropped rather than developed. There was simply less that could be built on it.
For anyone still studying it, the ordinary handling cautions apply and weigh more for a spray in regular use than for a sealed vial: repeated warming and cooling is hard on a solution, which the freeze-thaw page explains. The literature is thin; the material is still a peptide and behaves like one.
What we supply
DSIP in the catalogue
HPLC release testing at 99% minimum, one certificate per production lot.
Related reading
Where DSIP fits in
The rest of the picture, in three pages.
Frequently asked
About DSIP
What readers ask once they have got this far.