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Common symptoms can include: Extreme fatigue Lethargy Loss of appetite headaches Feeling faint or dizzy Breathlessness Headaches Heart palpitations Tinnitus Additional symptoms of B12 deficiency can include psychological problems such as low mood, irritability, depression, cognitive changes, or blurred memory
The metaphor of awakening sluggish or dormant neurons can be misleading
Clinical literature documents anaphylaxis cases following parenteral vitamin B-12 administration, particularly with cyanocobalamin formulations
