Understand the source comparison
Practical Comparison: Dosing, Timing, and Reconstitution Protocols
DSIP is typically reconstituted from lyophilised powder using bacteriostatic water at a concentration of 2mg per mL, stored at 2–8°C, and administered subcutaneously 30–60 minutes before intended sleep onset. Research protocols commonly use 100–500 micrograms
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- DSIP is typically reconstituted from lyophilised powder using bacteriostatic water at a concentration of 2mg per mL, stored at 2–8°C, and administered subcutaneously 30–60 minutes before intended sleep onset. Research protocols commonly use 100–500 micrograms per administration, with most investigators starting at 100mcg and titrating upward based on subjective sleep quality metrics and polysomnography data where available. DSIP's half-life is approximately 15–20 minutes in circulation, but its effects on delta-wave architecture persist for 6–8 hours due to downstream GABAergic potentiation. The compound initiates a cascade rather than acting as a sustained agonist.
- Selank reconstitution follows similar sterile technique: bacteriostatic water added to lyophilised peptide, concentration typically 2.5mg per mL, refrigerated storage mandatory. Standard research dosing ranges from 250 micrograms to 1,000 micrograms administered subcutaneously or intranasally during waking hours. Most commonly in the morning or early afternoon. Intranasal administration achieves faster CNS penetration (peak plasma concentration within 10–15 minutes vs 30–45 minutes subcutaneously), but bioavailability is approximately 60% compared to subcutaneous routes. Selank's plasma half-life is roughly 20–30 minutes, yet its anxiolytic effects persist for 4–6 hours due to sustained BDNF upregulation and monoamine modulation.
- The critical practical difference: DSIP loses efficacy if administered more than 90 minutes before sleep or during daytime hours. The compound works with existing circadian sleep pressure, not against it. Administering DSIP at 2 PM won't induce sleep because adenosine tone and SCN (suprachiasmatic nucleus) signalling aren't aligned for sleep initiation. Selank, conversely, produces no benefit if taken immediately before bed. It modulates waking-state stress resilience, not sleep architecture. Timing windows are non-negotiable for both compounds.
- Our team recommends Cerebrolysin for researchers investigating neuroprotection pathways alongside cognitive performance peptides, and exploring compounds like Dihexa when neuroplasticity mechanisms are the research focus.