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24, 299326, doi: 10.1146/annurev.nutr.24.012003.132440 (2004)
Lets take a look at both of these scenarios: Studies show that Lactobacillus and Bifidobacterium species can synthesize some riboflavin
8,15 Serum holotranscobalamin level, which is reduced in vitamin B 12 deficiency, compared favorably with homocysteine and methylmalonic acid levels as a confirmatory test in one study, but further trials are needed before its widespread use for this purpose can be recommended
For those over 50, getting most of their Vitamin B12 from supplements and fortified foods is key
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