Small human studies from the late 1970s–1980s; no modern controlled trial and no systematic adverse-event data
Delta sleep-inducing peptide was isolated from rabbit brain in 1977 and studied in humans through the 1980s for insomnia and withdrawal states, in small trials that a 2006 review called inconclusive. None of that work recorded adverse effects systematically, and there has been no controlled trial since. What follows is what the literature contains — which is very little.
Research-use information only. Research-grade DSIP is not an approved medicine; where trial or label figures appear below they belong to the pharmaceutical product studied, not to any research vial. This page does not give dosing or medical advice.
Every rate carries its source. Where no source exists, no rate is printed.
| Effect | Rate (sourced) | Detail | Source |
|---|---|---|---|
| Adverse effects in the early human studies | not quantified | Not systematically recorded; reports describe the peptide as well tolerated without giving numbers. | Kovalzon 2006 (review) |
| Injection-site reactions | not quantified | Expected for any injected peptide; unquantified for DSIP. | General |
Regulatory status: Not approved anywhere.
Everything above describes DSIP the molecule. The risk specific to a research vial is different: it may not contain DSIP at the labelled amount, and it may contain what the synthesis left behind. Identity (mass spectrometry), purity (HPLC), measured net content and an endotoxin result are the four lines on a certificate that bear on adverse effects, and only a certificate you can check at the laboratory tells you any of them. This is what we have verified for DSIP so far.
9 of the 77 vendors on our scoreboard list DSIP with a price we read on the product page (23 Sept 2026–23 Sept 2026). Of those, 9 name their testing laboratory, 6 publish certificates that resolve on the lab's own site, and 8 publish measured milligrams against the label. The full ranking, with every dated price, is on Best DSIP Vendors.
| Vendor | Rubric | Lab named | Price read |
|---|---|---|---|
| Peptide Giantspartner | 10/10 | Janoshik Analytical · Vanguard Laboratory | $21.99 · 5mg · 23 Sept 2026 |
| Purgo Labspartner | 10/10 | SteriGenix · Freedom Diagnostics | $35.99 · 10mg · 23 Sept 2026 |
| Ameano Peptidespartner | 9/10 | Janoshik Analytical | $58.00 · 10mg · 23 Sept 2026 |
| Everest Peptides | 8/10 | Freedom Diagnostics | $26.24 · 5mg · 23 Sept 2026 |
| PS Peptidespartner | 8/10 | North American Diagnostics | $39.99 · 5mg · 23 Sept 2026 |
Top 5 by rubric score; 4 more on the ranking page.
None yet for DSIP specifically. The COA library holds the certificates we have read for each vendor on other compounds, which is the next best signal of how that vendor documents a lot.
Unknown in the way that word is normally used. Early small human studies reported no obvious harm but did not measure adverse effects systematically, and nothing controlled has been done since. Absence of data is not evidence of safety.