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Age-related factors Older people are at more risk because with age the production of stomach acid and intrinsic factor (a protein necessary for B12 absorption) can decrease
Pharmacol Rev
Hepatocytes take up medications, environmental chemicals, steroid hormones, bilirubin and metabolic products from the blood
Human data are somewhat more reassuring for accidental early exposure, but there is still not enough evidence to recommend continuing these medications throughout pregnancy
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