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Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency
Fatigue, lethargy, low mood, shortness of breath, and nerve problems can all be symptoms of vitamin B12, or folate, deficiency
Vitamin C injections are contraindicated for patients with G6PD deficiency (risk of fatal hemolysis), kidney disease (risk of oxalate nephropathy), and iron overload conditions
Tell your doctor or pharmacist if any effect persists or worries you
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