Chronic conditions impacting absorption include atrophic gastritis or pernicious anaemia, where there is a lack of intrinsic factor, a protein essential for the uptake of B12 in the digestive tract
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Some of these symptoms can also happen in people who have a vitamin B12 deficiency but have not developed anaemia, said Dr Aravinda
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After each increase, blood levels peak over 24 to 72 hours, when nausea and fullness are most likely to return. These effects usually ease during the four-week hold
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