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Methylcobalamin and cyanocobalamin are two forms of vitamin B12, both used to treat and prevent vitamin B12 deficiency
DOI: 10.3390/molecules191119066
In patients with mild cognitive impairment (often a precursor to Alzheimers disease), prolonged melatonin supplementation reportedly slowed the progression of cognitive decline and improved sleep and mood, though larger trials are needed
Many patients report changes within 4-8 weeks, with continued improvement over several months
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