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[Accessed on: September 9, 2011]

However, a small study from 2021 argues that differences in bioavailability between the two forms are negligible and that cyanocobalamin may maintain serum levels better

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Compared to 108 control subjects without evidence of dementia, subjects with dementia of Alzheimer's type and confirmed Alzheimer's disease had higher blood levels of homocysteine and lower blood levels of folate and vitamin B 12

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It has even been proposed that NNMT be considered as a novel and sensitive serum biomarker for detecting colorectal cancer, outperforming the clinical significance of carcinoembryonic antigen (CEA) (42)