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One of eight B complex vitamins, B12 plays a key role in red blood cell formation, cellular metabolism, nerve function, and DNA production

There are no other absolute contraindications reported for hydroxocobalamin use in deficiency states, but caution is advised in individuals with conditions such as early Lebers optic neuropathy (a rare hereditary optic atrophy) due to the theoretical risk of worsening vision

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However, many people think that antibiotics are only meant to kill bacteria