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Naturally, vitamin B12 can be found in food such as meat, fish and dairy where b12 attaches itself to protein, which is separated by stomach acid during digestion, allowing it to be absorbed into the bloodstream
Pernicious anemia occurs more commonly in people who already have diseases that are linked to immune-system abnormalities, such as Graves disease, hypothyroidism (under-functioning thyroid gland), thyroiditis (inflammation of the thyroid), vitiligo, and Addison's disease (adrenocortical insufficiency)
The B12 delivery methods require several days to weeks to produce noticeable effects because of their absorption speeds
Divide your dose (mg) by the concentration
The answer depends on several factors, including the cause and severity of deficiency, your overall health, and how long symptoms have been present