DSIP, short for Delta Sleep Inducing Peptide, is a niche but highly targeted sleep-soothing peptide in the peptide world. Unlike peptides like GHRP and CJC, which incidentally improve sleep, DSIP is a purely targeted peptide focused on calming the nerves, promoting sleep, and relieving nervous tension. Having worked with raw materials for so long, I genuinely believe it's a lifesaver for those who stay up late, suffer from neurasthenia, experience high stress, or have difficulty falling asleep. It's non-stimulating, non-irritating, and doesn't have any shaping effects; it focuses solely on helping the body relax, stabilize sleep, and relieve nervous fatigue, leaving a particularly clean and reassuring feeling.
Core Research Value
Sleep Framework Tool Peptide: One of the preferred long-standing drugs for NREM/delta wave studies, insomnia models, and circadian rhythm (SCN, melatonin interaction) controls.
Clean Anti-Stress Profile: In animals, it can reduce stress-induced cortisol spikes, incidentally leading to clues in antioxidant, neuroprotective, and chronic pain/withdrawal research.
Outrageously short: The plasma half-life is approximately 15 minutes. The N-terminal Trp is instantly destroyed by aminopeptidase, resulting in extremely high fluctuations in in vivo data. Conflicting research findings have persisted for nearly 50 years.
A dose of reality: Double-blind studies in humans have shown very poor reproducibility. Modern sleep medicine does not use it as a hypnotic drug. It is not approved by the FDA, nor is it listed separately by WADA, but it falls into the gray area of "research compounds." The "500 μg subcutaneous dose for promoting deep sleep recovery" used in fitness circles is a community dose, not a clinical protocol.
Storage (lyophilized powder reagent diameter):
Unreconstituted lyophilized powder: Store at -20℃ in a sealed, light-protected, and dry place. Most brands indicate a shelf life of 1–2 years; at -80℃, it can last 2–3 years. It is hygroscopic, and Trp is susceptible to light oxidation. Use desiccant and wrap the bottle with aluminum foil; avoid frequent opening.
After reconstitution: Dissolve in sterile water/physiological saline/BAC at a concentration of 0.1–1 mg/mL; at -20℃, aliquots can be stored for approximately 1 month; at -80℃, approximately 6 months; at 4℃, it can only be stored for a few days to two or three weeks, not for long-term use.
Major Contraindications: Repeated freeze-thaw cycles, exposure to moisture, and UV exposure.
Precautions:
Before opening, allow the container to equilibrate at room temperature for 15–20 minutes. Otherwise, the negative pressure inside the bottle will draw in air and moisture, causing the nonapeptide to clump and directly reducing its activity.
Slowly add water along the wall, avoiding vortexing-the N-terminal Trp is already easily cleaved; further agitation due to shear force will reduce the in vitro half-life from 15 minutes to 5 minutes, resulting in distorted Western blotting/EEG results.
The fifth Asp must be in the α-configuration (α-Asp5); the β-Asp5 isomer is inactive. High temperatures, extreme pH levels, and prolonged solution storage can cause isomerization. If the COA (Copy of Account) doesn't specify configuration identification, be mindful of this before conducting functional experiments.
Low-concentration adsorption glass: Use low-adsorption tubes/polypropylene for preparing stock solutions whenever possible, avoid ordinary glass bottles. A concentration of a few μg/mL can absorb half a tube.
It's only a research reagent: Sigma's D4072 is labeled "for research, not for human use," meaning it's not a legal drug for subcutaneous injection. Even for in vivo experiments, ethical/IACUC (Intra-Aggregate Intake and Control) approval is required. Don't treat the supplier's label as a prescription.
When performing sleep EEG, remember to include an artificial cerebrospinal fluid infusion control-many early "induced delta wave" positive results were later found to be partly due to sleep pressure caused by the injection procedure itself.
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