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Difficulty breathing
In patients with Leber's disease, administration of cyanocobalamin may cause acute and rapid atrophy of the optic nerve
More information about what each of the B vitamins can and cannot do is found in the Background section and in the ConsumerTips sections for each of the B vitamins
These doses are well tolerated and have no meaningful toxicity risk, as excess B12 is excreted in urine rather than accumulating in tissues
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