Side-by-side comparison
DSIP vs Selank — Price & Profile Comparison
DSIP
Circadian PeptideSafety 8/10Sleep / circadian research
Selank
Cognitive & Anxiolytic PeptideSafety 8/10Anxiolytic / nootropic research
The short answer
DSIP vs Selank: which to choose
Selank is the cheaper option — roughly $21 vs $28 for the lowest verified listing. Selank is the more widely stocked of the two (34 vendors vs 28). Both hold the same 8/10 safety rating in our methodology. They target different goals — DSIP is a circadian peptide compound while Selank is a cognitive & anxiolytic peptide one — so they're often complementary rather than direct substitutes.
Price Comparison — 2026
DSIP
Selank
Vendors Carrying Both
24 vendors stock both DSIP and Selank — convenient if you want to bundle an order.
Safety Notes
DSIP
FDA: Not FDA-approved
Benign profile: well-tolerated in human studies (incl. a 1991 double-blind insomnia trial), with no reported tolerance, dependence, or withdrawal. Endogenous nonapeptide; main limitation is thin/old data, not safety signals.
Selank
FDA: Approved in Russia
Approved in Russia; no sedation, amnesia, or dependence; appears very well-tolerated; limited Western data