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Since there is no known hazardous threshold for vitamin B12, there is no upper limit
It then needs to be converted to glucose, the bodys primary source of energy
p 800 patients with a documented cobalamin deficiency, median age 71 years), FCM accounts for about 6070% of the cases of vitamin B12 deficiency in elderly patients, whereas Biermers disease accounted for only 1525% [38]
[1] These are exceedingly uncommon and possibly coincidental findings
After excluding those taking B12 and those already known to have cancer, 250 patients were followed for roughly two years
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