Vitamin B12 deficiency risk factors

Vitamin B12 deficiency Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Risk Factors

In vegans the risk is very high because none of their natural food sources contain B12. One American study found blood levels below normal in 92 % of vegans, 64 % of lactovegetarians, 47 % of lacto-ovovegetarians . The study applied the old normal values, so in reality a considerably greater proportion may have been deficient.