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Oral Supplements Cyanocobalamin tablets (common) Methylcobalamin (easier to absorb) B12 sprays or dissolvable tabs Pros: Easy to take No needles Affordable Cons: Absorption varies Not ideal for GI conditions Food Sources Liver (highly concentrated) Eggs Red meat Cheese Shellfish and fish Plant-based
More advanced studies using peptide microarray (148) and suspension multiplex immunoassay (149) have also not found a significantly higher EBV anti-immunoglobulin (Ig)-G response in ME/CFS patients in comparison to controls
Seek immediate emergency care (call 999 or go to A&E) if you experience symptoms of a severe allergic reaction after a B12 injection, such as difficulty breathing, facial or throat swelling, widespread rash, or dizziness
Because B12 injections are perceived as low-stakes, some facilities devote minimal attention to screening, monitoring, and emergency readiness
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