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It doesn't stay in one place
In her case, the lack of B12 contributed to the loss of myelin sheath in the spinal nerves that transmit this signal
For Lebers optic atrophy or smokers blindness, the usual dose starts at 1000mcg, given daily for 2 weeks, followed by twice weekly
Nausea, headache, or flushing during early titration often dose- and rate-dependent
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