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The following Medical Subject Heading and free-text search terms associated with vitamin B 12 were input: vitamin B12 OR cobalamin OR cyanocobalamin OR methylcobalamin OR adenosylcobalamin OR hydroxycobalamin OR holotranscobalamin OR B12 deficiency OR vitamin B12 metabolism, which were first used singly and then subsequently matched, in turn, with the terms associated with COVID-19 and other respiratory viral infections: COVID OR COVID-19 OR SARS-CoV-2 OR SARS-CoV OR MERS OR respiratory infection OR viral infection OR viral disease. 34 The third round of searches ensued with terms referring to how the virus gains entry and causes damage in organs

The Cochrane Database of Systematic Reviews (4) CD004514

Week 1-2: Adjustment phase The first two weeks primarily involve physiological adjustment rather than visible results

The condition differs from other forms of B12 deficiency because it stems from an autoimmune process attacking parietal cells rather than dietary insufficiency or malabsorption disorders

When levels are low, metabolism can feel sluggish even with good habits in place

It is used to manage general weakness, intense fatigue, weakness, lack of concentration, confusion and irritability