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has also shown, in a clinical study, that patients with mild to moderate dementia manifested improved cognitive ability

Wu T, Hallett M

Superior immune responses induced by intranasal immunization with recombinant adenovirus-based vaccine expressing full-length Spike protein of Middle East respiratory syndrome coronavirus

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The "as needed" approach reflects that NAD+ is a coenzyme, not a receptor agonist there's no desensitization concern in the same way