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A study comparing individuals with insomnia to healthy sleepers found significantly lower glutathione peroxidase activity in the insomnia group

For context, the GHK-Cu copper peptide another compound with a strong preclinical profile faces similar evidence constraints

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From an entity hierarchy perspective: DSIP Neuroactive endogenous peptide (research classification) Neuromodulatory / sleep-associated peptide system Supplied as research peptide by RPL Peptide Technical Specification Table Product Introduction DSIP (Delta Sleep-Inducing Peptide) is a low-molecular-weight neuroactive peptide originally identified in mammalian brain extracts and studied for its potential role in sleep regulation, stress modulation, and neuroendocrine signaling pathways