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Dietary folate intake, alcohol, and risk of breast cancer in a prospective study of postmenopausal women

Conditions such as reduced stomach acid, digestive disorders, or certain medications can interfere with this process, meaning someone can consume enough B12 yet still become deficient

Subcutaneous B12 administration, although promising in select cases such as congenital cobalamin disorders, lacks comprehensive comparative studies against IM and oral routes

it does not reliably modify appetite-regulating circuits beyond baseline in healthy individuals

Or is it to do with the sheer amount of work B12 has to do in the body