Signs and symptoms of vitamin B12 deficiency can include fatigue, pale skin, headaches, shortness of breath, fast heartbeat, gastrointestinal issues, mouth inflammation, paresthesias (abnormal sensations), decreased cognitive ability, depression, muscle weakness, imbalance and incoordination, vision problems, and erectile dysfunction
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Side effects and precautions Vitamin B12 injections are generally safe, but some side effects have been reported
This choice depends on the patients health and the doctors advice
Large population studies have shown that unexplained B12 levels above 813 pg/mL are associated with an increased risk of cancer diagnosis within one year, though the absolute risk for any individual is still relatively low