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Vitamin B12 and cognitive decline

They reported significantly decreased concentration of 25(OH) D and increased concentration of homocysteine in the serum of patients with dementia when compared to age-matched controls and patients with mild cognitive impairment (MCI) and also reported that an association of serum levels of vitamin D with markers of cognitive decline as well as serum homocysteine levels was observed in patients with dementia and MCI when compared to controls.[1]