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Still, its not clear whether B12 supplementation can reduce the risk of heart disease directly (13)

B12 shots are also beneficial for individuals with pernicious anemia, a condition characterized by the inability to absorb vitamin B12 from food

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

ranges below are illustrative only

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The B12 delivery methods require several days to weeks to produce noticeable effects because of their absorption speeds