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During this time, an older person might have barely noticeable symptoms, or the symptoms might be attributed to another chronic health condition

Vitamin B12 is considered safe and generally well-tolerated, even at high doses

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[15] During lactation, parenteral vitamin D markedly raises breast-milk concentrations and can support infant status, yet guidelines still advocate infant drops of 400 IU day and recommend maternal monitoring to ensure neither mother nor child approaches toxic thresholds

NNMT (nicotinamide N-methyltransferase) catalyses the methylation of nicotinamide using S-adenosylmethionine (SAM) as the methyl donor, producing 1-methylnicotinamide (1-MNA) and S-adenosylhomocysteine