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A vitamin D level guides whether to correct a deficiency, since low vitamin D is associated with higher dementia risk in observational and genetic studies while supplementation trials for cognition have been null, so correcting a low level is reasonable and pushing it above normal is not

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Delta Sleep-Inducing Peptide (DSIP) is a nine-amino acid regulatory neuropeptide first identified in 1977 by Marcel Monnier and colleagues at the University of Basel, isolated from the cerebral venous blood of rabbits following low-frequency hypnogenic electrical stimulation of the intralaminar thalamic nuclei