Delta sleep-inducing peptide (DSIP) is a small neuropeptide used as a reference compound in laboratory research. This guide covers where it came from, its sequence, storage points that follow from its chemistry, and what the independent report on our 5 mg vial found. It describes chemistry only, not effects in people or animals.
Where the name comes from
DSIP was isolated in 1977 by a research group in Basel, Switzerland. The name comes from the experiments in which it was first described, which recorded “delta” (slow-wave) activity in the brain. Its biological role has remained a subject of research ever since, and the name reflects its history rather than an established function.
Sequence
DSIP is a nonapeptide, a chain of nine amino acids:
Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu
- One-letter code: WAGGDASGE.
- Molecular formula C35H48N10O15, molecular weight about 848.8 g/mol.
- Net charge at neutral pH of about −2: the aspartic and glutamic acid side chains and the C-terminus are negative, and only the N-terminus is positive.
Storage: why light matters
The first residue, tryptophan, is the amino acid most prone to oxidation by light and air. Keeping DSIP cold, dry and dark protects that residue:
- Unopened, long term: −20 °C, protected from light.
- Unopened, short term: 2–8 °C for up to several weeks.
- Let the vial reach room temperature before opening, so moisture does not condense on the powder.
- After reconstitution: keep at 2–8 °C, out of the light, and write the preparation date on the vial.
What the lab report shows
| Product | DSIP 5mg |
|---|---|
| Label | 5 mg |
| Measured: DSIP | 5.57 mg |
| Purity | 98.690% |
| Report | Janoshik #215327, analysed 31 Jul 2026 |
| Verification key | I2BCSZHCFUJP |
In the batch tested for report #215327, Janoshik measured 5.57 mg of DSIP against 5 mg on the label, at 98.690% purity.
Enter the verification key at janoshik.com/verify to see the laboratory’s own record of the test.
In our range
For laboratory research use only. DSIP is not registered on the Australian Register of Therapeutic Goods, and nothing on this page describes use in humans or animals.
