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Many of the symptoms caused by low B12 levels are not specific to B12 deficiency, which can cause the condition to go undetected
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A: B12 toxicity is extremely rare because excess amounts are eliminated through urine
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The ability to shuttle between the +1, +2, and +3 oxidation states is responsible for the versatile chemistry of vitamin B 12 , allowing it to serve as a donor of deoxyadenosyl radical (radical alkyl source) and as a methyl cation equivalent (electrophilic alkyl source)
mixed bed systems, however, are a different story
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