DSIP

DSIP, or Delta Sleep-Inducing Peptide, is a naturally occurring neuropeptide - a short chain of nine amino acids linked in a defined sequence, with a molecular weight of roughly 850 daltons. That places it among the smaller peptides referenced in laboratory literature. Researchers study it alongside other neuropeptides examined for associations with sleep architecture and hormone signaling. On this site, DSIP is cataloged purely as a reference compound: we describe its documented structure and classification, not any effect, outcome, or use in a living organism. It is supplied and discussed here for research and laboratory purposes only, and is not a drug, supplement, or finished consumer product.

DSIP is a small protein fragment that occurs naturally in the body, built from nine linked amino acid building blocks in a fixed order. Its short length and defined sequence place it in the same general size class as other reference neuropeptides studied for their relationship to sleep and hormone activity. Everything on this page describes DSIP as a research compound - its documented composition, molecular weight, and category - not as a product meant for use. It is for research and educational reference only, has not been evaluated or approved by the FDA for any purpose, and is not intended for human or animal use, consumption, or administration in any form.

DSIP (Delta Sleep-Inducing Peptide)

This entry covers the hardware side of working with DSIP in a research setting — pen and cartridge compatibility only. Everything referenced here is supplied for research, educational and demonstration use only.

Which cartridges fit the pens?

Our reusable pens are built for standard 3 ml glass cartridges with an 11 mm long plunger (stopper) — the cartridge format we sell. Some 3 ml cartridges on the market use a shorter, roughly 8 mm plunger instead. The glass looks identical from the outside, but a pen is built for one plunger height, so the short-plunger format is not compatible with our pens. If sourcing cartridges elsewhere, confirm the 11 mm long plunger before loading one.

Do the cartridges work with other pens too?

Our cartridges are matched to our own pen's mechanism and dimensions. We have not tested them in pens from other manufacturers, so we cannot confirm or deny compatibility with third-party hardware.

What it is

DSIP, short for Delta Sleep-Inducing Peptide, is a small, naturally occurring neuropeptide (a chemical messenger used by the nervous system). It is built from nine amino acids (the building blocks of proteins), in this exact order: Trp-Ala-Gly-Gly-Asp-Ala-Ser-Gly-Glu. It weighs about 850 daltons (a dalton is a tiny unit scientists use to measure how heavy a molecule is). Its structure is amphipathic, meaning one part mixes easily with water while another part repels it, similar to how soap works.

Scientists first isolated it in the 1970s from blood drawn near the brains of sleeping rabbits. Its name comes from early reports that it boosted delta-wave brain activity, the slow brain waves recorded during deep sleep with a device called an EEG. Research-grade DSIP is produced by chemical synthesis rather than taken from animal tissue, giving research teams a consistent, defined starting material for in vitro and lab-based study rather than a mixture extracted from biological source material.

Research context and categorization

DSIP is classified among research peptides studied in relation to sleep and hormonal signaling (the chemical messengers that regulate many body systems). Within the published literature, it is most frequently referenced alongside sleep architecture — the structure and sequencing of sleep stages — and slow-wave, deep-sleep activity.

A smaller body of work places DSIP in a broader category tied to the HPA axis (the brain-adrenal pathway involved in the body's stress response), pain signaling, opioid-related research models, neuroprotection, and the release of certain hormones. This overlap is one reason the compound sometimes appears in recovery and stress research literature rather than sleep research alone, and why some researchers treat it as a multi-system signaling peptide rather than a single-category compound.

Key point: The existing literature on DSIP is limited in volume, largely decades old, based on small sample sizes, and unresolved on mechanism. Confirmatory human data is minimal. It remains classified as an experimental research compound, with no approved or established use in people or animals.

Status

• Regulatory status: DSIP remains an unapproved, experimental research compound. A regulatory review of DSIP (also known as emideltide) for inclusion on a special compounding list has been discussed for a 2026 advisory committee meeting, but discussion on that list is not the same as approval, and listing status can change before or after that meeting.
• Sport status: DSIP does not appear by name on the WADA Prohibited List. It can nonetheless fall under class S0 (Non-Approved Substances), which prohibits unapproved substances broadly. Anyone subject to drug testing should treat DSIP as potentially prohibited and confirm directly with their sport's anti-doping authority before any laboratory use. This section reflects current published status only and can change without notice.

Reconstitution notes (general)

Lyophilized (freeze-dried) peptides are typically reconstituted with bacteriostatic water - water carrying a small amount of benzyl alcohol as a preservative, which slows bacterial growth across repeated draws from the same vial. Calculating the resulting concentration is simple division: milligrams of peptide in the vial divided by milliliters of diluent added.

For example, 5 mg of powder mixed into 2.5 mL of water gives a concentration of 2 mg/mL. A reconstitution calculator is available at peptide calculator to check the math for any vial and fill volume.

Benzyl alcohol's job is strictly antimicrobial - it does not change the concentration math above. But it is not chemically neutral for every peptide over time, and tolerance and stability figures differ by compound. Documentation that accompanies a specific peptide (not a general assumption) is the reference point for how long a reconstituted vial is expected to hold, and what diluent it was validated with.

Dilution and handling notes (compound-specific)

Reconstitution Ratios

DSIP is supplied as a freeze-dried powder, usually in 5 mg or 10 mg vials, and is mixed with water for laboratory use. Common working concentrations fall in the range of about 1 to 5 mg/mL.

Because of this, a 5 mg vial is often paired with about 1 to 2 mL of bacteriostatic water, and a 10 mg vial with about 2 to 3 mL. The amount of water chosen depends on what concentration the researcher needs for accurate small-volume measurements. There is no single fixed rule.

More water gives a more dilute solution that's easier to measure in fine increments; less water gives a more concentrated solution in a smaller volume. DSIP dissolves easily and normally reaches its final appearance within a few minutes of gentle mixing, without turning into a gel.

Solution Appearance and Concentration

Because DSIP is amphipathic (partly water-loving and partly water-repelling, like a soap molecule), a faint haziness or cloudiness can appear at higher concentrations, roughly above 1 mg/mL. This is a normal physical property and does not by itself mean something went wrong with the mix.

Very dilute solutions, below about 0.5 mg/mL, tend to look crystal-clear. Pushing the concentration much higher, above about 10 mg/mL, raises the risk of visible solid crystals forming in the liquid.

The practical fix is to keep concentration in a moderate range rather than over-concentrating a single vial. Cloudiness that appears and won't clear, or that persists well past the first few minutes, points to clumping of molecules (aggregation) rather than normal haziness, and should be treated as a problem.

Handling Quirks, Light Sensitivity, and Diluent Notes

Two handling details are worth noting. First, DSIP contains a tryptophan building block and is light-sensitive. It must be kept away from direct light, using amber vials or shielded storage, to limit oxidation (chemical breakdown caused by exposure to light and air).

Second, add the bacteriostatic water slowly down the inner glass wall rather than squirting it onto the powder, then swirl or roll the vial gently instead of shaking or vortexing it - vigorous mixing creates foam, and the air-liquid interface at the bubbles can break down peptide molecules.

A related question that comes up often: bacteriostatic water contains a small amount of benzyl alcohol as a preservative, which is why a reconstituted vial can be entered multiple times instead of single-use. At the concentration used, benzyl alcohol is generally compatible with peptides for short-duration work, though published stability literature notes it can contribute to gradual degradation of sensitive peptides across repeated freeze-thaw cycles or long-term storage. Some researchers reconstitute with plain sterile water instead when long-term stability at a fixed concentration matters, trading multi-entry convenience for a simpler solution.

Let both vials warm to room temperature before mixing, and wipe the rubber stoppers with an alcohol swab. This helps the powder dissolve cleanly. After mixing, inspect the solution for clarity before laboratory use.

Handling and storage

To preserve peptide stability, researchers typically follow these storage and handling steps:

• Store the mixed vial in the refrigerator at 2 to 8 degrees Celsius, kept protected from light.
• Wipe the rubber stopper with an alcohol swab before each needle puncture.
• Write the mix date on the vial label so its age can be tracked.
• Bacteriostatic water's benzyl alcohol preservative is what supports a longer refrigerated window in the first place; with it, most researchers use the mixed solution within about four weeks (around 28 days) before discarding it.
• Discard any vial right away if the solution turns cloudy and stays that way, changes color, or shows floating particles or solid bits - these changes indicate the peptide has degraded, regardless of how long it has been stored.

Frequently asked questions