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Certain medications can interfere with vitamin B12 absorption or metabolism, potentially leading to abnormal B12 levels in the blood, especially in cases where the body does not absorb or utilise B12 properly

[DOI] [PMC free article] [PubMed] [Google Scholar] 126.Varesio C, Grumi S, Zanaboni MP, Mensi MM, Chiappedi M, Pasca L, Ferraris C, Tagliabue A, Borgatti R, De Giorgis V

Klinger JR, Abman SH, Gladwin MT

How long before a death occurs

Here are some good food sources of vitamin B12: Advertisement | page continues below 3 ounces of cooked clams, without shells: 17 mcg 3 ounces of cooked oysters: 14.9 mcg 1/4 cup of fortified nutritional yeast: 8.3 to 24 micrograms, depending on the brand 3 ounces of cooked Atlantic salmon: 2.6 mcg 3 ounces of cooked ground beef, 85% lean: 2.4 mcg 8 ounces of 2% milk: 1.3 mcg 6 ounces of plain, fat-free yogurt: 1.0 mcg 1 serving of fortified breakfast cereal: 0.6 mcg 1 1/2 ounces of cheddar cheese: 0.5 mcg 1 large cooked egg: 0.5 mcg (A 3-ounce serving of meat or fish is about the size of a deck of cards.) Do you need a vitamin B12 supplement during pregnancy