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b12 injection overdose side effects Vitamin B12: and Too Much B12 Symptoms: Overdose
Description
Experiments in a rat tibial nerve injury model indicated that vitamin B12 promoted myelin formation and reduced Wallerian degeneration 18

PMID 25977272
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Still, stronger is not always better

Benefits of Oral Vitamin B12 Supplements Convenient and Easy to Use : Oral supplements are straightforward to take and do not require professional administration

Research is ongoing
