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doi:10.1002/jor.21107 Bock-Marquette I, Saxena A, White MD, DiMaio JM, Srivastava D
[6] [25] At levels only slightly below normal, deficiency can result in fatigue, headaches, feeling faint, rapid breathing, pale skin, numbness or tingling, poor appetite, heartburn, poor balance, difficulty walking, poor reflexes, blurred vision, memory problems, depression, irritability, inattention, cognitive decline, dementia, and even psychosis
Summary: High vitamin B12 levels rarely cause direct symptoms