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Having a lack of intrinsic factor (IF) , a substance that binds to B12 so it can be absorbed into the bloodstream (5)
Blusztajn, Jan Krzysztof
While many people take B12 vitamins in pill form, the body often struggles to absorb them through the digestive tractespecially for those with gut health issues or dietary restrictions
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The choice between PO and IM vitamin B 12 seems ideal for shared decision making
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