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1,2 SORT: KEY RECOMMENDATIONS FOR PRACTICE Figure 1 In the United States and the United Kingdom, the prevalence of vitamin B 12 deficiency is approximately 6% in persons younger than 60 years, and nearly 20% in those older than 60 years

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Experimental work described by Patt et al

The average person might be drinking three

A deficiency may not manifest for several years, since the vitamin can be retained for a long period in the liver