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The prevalent causes of vitamin B 12 deficiency are (1) an autoimmune condition known as pernicious anemia, and (2) a disorder called food-bound vitamin B 12 malabsorption

If you have pernicious anemia, you'll have them in your blood

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While these anecdotes can be compelling, they dont account for natural recovery, placebo effects, or individual variationwhich is why they sit firmly at the bottom of the evidence hierarchy