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Dietary deficiency: Vegans (strict vegetarians who do not eat any meat, fish, egg, or dairy products) can develop vitamin B 12 deficiency because they lack vitamin B 12 in their diets
^ Biosynthesis of a central intermediate in hydrogen sulfide metabolism by a novel human sulfurtransferase and its yeast ortholog
Squire, P., Naude, J., Zentner, A., Bittman, J
Ding, B
If your deficiency is related to your diet, you may be advised to take vitamin B12 tablets or an injection twice a year
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