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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)?
When levels drop, the symptoms can be subtle at first, then hard to ignore
One sailed through safety trials but stumbled on efficacy
You want appropriate inflammation that resolves on time
Within the first week, many patients report a reduction in the background level of discomfort from chronic injuries
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