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Those with digestive issues, like Crohns disease or celiac disease, that impair nutrient absorption
The systematic review protocol was registered in the International Prospective Register of Systematic Reviews (PROSPERO), registration number: CRD42024554513 (Available from) ( 2.2 PICOs question The primary research question addressed in this review was: What is the effectiveness of sublingual/oral administration of Vitamin B12 alone or compared to other forms of administration (e.g., intramuscular injection)?
87 Mayer, G., Krger, M
Vitamin B12 injections are used to treat low B12 levels when diet or tablets are not enough
Lifestyle Factors Studies indicate that your diet and medication use can affect how long vitamin B12 stays in the body
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