DSIP

Delta Sleep-Inducing Peptide (DSIP) is a nonapeptide isolated in 1977 from cerebral venous blood of rabbits during deep sleep. It has since been studied in animal and limited human models for sleep regulation, stress reduction, pain modulation and withdrawal syndromes. There is no approved clinical program and most data are preclinical or observational.

The exact mechanism of action is not fully elucidated. DSIP has been linked to modulation of GABAergic and serotonergic neurotransmission, normalization of the hypothalamic-pituitary-adrenal axis under stress, and possible influence on sleep architecture via the suprachiasmatic nucleus. The peptide is rapidly cleared, explaining its short duration of action.

Store the sealed lyophilized vial at 2-8 °C, protected from light; brief exposure to room temperature during shipping is generally tolerated. Refrigerate after reconstitution at 2-8 °C and use within the period supported by stability data for the substance (typically 2-4 weeks). Avoid repeated freeze-thaw cycles: each cycle increases the risk of aggregation and hydrolysis of the peptide bond. Do not shake the vial; swirl gently and direct the liquid stream against the glass wall rather than at the powder cake.

• Sealed lyophilized vial, stored as supplied
• Bacteriostatic water (0.9% benzyl alcohol) for reconstitution
• Insulin syringes (29-31G, 0.5 mL / 100 units)
• Reconstitution syringe (1-3 mL, 21-23G needle)
• 70% isopropyl alcohol swabs
• Sharps container for used needles
• Labels and a logbook for batch, date and volume

Animal studies report prolonged sleep, increased REM sleep and reduction of stress markers. Limited human studies describe subjective improvement in sleep quality and reduction of chronic pain, but the studies are small and not always controlled. Reported adverse effects are minimal and include local injection-site irritation and transient drowsiness. Long-term safety data are lacking.

Wash your hands, then disinfect the vial septum and the injection site with 70% isopropyl alcohol and allow both to air dry. Draw up the intended volume, remove air bubbles and pinch a subcutaneous skin fold. Insert at a 45-90° angle depending on fat thickness, aspiration is not required for subcutaneous administration, and inject slowly. Withdraw the needle, apply light pressure and discard the needle in a sharps container. Rotate injection sites systematically (abdominal quadrants, flanks, thighs) to prevent lipohypertrophy and local irritation.

Peptide research protocols are studied against a background of adequate protein intake (approximately 1.6-2.2 g/kg/day in the training literature), consistent sleep of 7-9 hours, and controlled training load. Sleep deprivation and chronic psychological stress both dampen growth hormone pulsatility and disrupt tissue remodeling, complicating the interpretation of any observed effect. Alcohol, smoking and large caloric deficits are likewise documented modifiers of recovery outcomes.

1. Schoenenberger G.A. et al. Characterization of a delta EEG sleep-inducing peptide. Pflügers Arch, 1977.
2. Schneider-Helmert D. et al. DSIP in clinical sleep induction. Adv Biosci, 1983.
3. Graf M.V., Kastin A.J. Delta sleep-inducing peptide (DSIP): a review. Neurosci Biobehav Rev, 1986.