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Food and Drug Administration (FDA) to diagnose, treat, cure, or prevent any disease or medical condition
Conclusion Vitamin B12 injections are a critical intervention for adults with severe deficiency or those unable to absorb the vitamin adequately through oral supplementation
Most patients experience minimal side effects, with the most common being mild injection site reactions that resolve quickly
Direct application: Do not apply undiluted powder directly to the skin or scalp
The honest summary: strong mechanistic and animal evidence, essentially no completed human efficacy trials
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