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B12 needs to be converted into its active form, methylcobalamin to be usable in the cells of your body

doi: 10.1097/01.ogx.0000279291.86611.46

Associations of one-carbon metabolism, related B-vitamins and ApoE genotype with cognitive function in older adults: identification of a novel gene-nutrient interaction

Rotating injection sites prevents tissue damage and maintains consistent absorption
