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The effects of a B12 shot typically last from 48-72 hours, though some people can experience benefits for several weeks to months

While not everyone experiences these, common side effects may include: Nausea : A common side effect, especially when starting treatment, but it often decreases over time

While generally well-tolerated, some individuals may experience mild side effects such as nausea, diarrhea, or constipation

[4] [5] Such development typically takes many years and must meet rigorous regulatory standards set by the MHRA and European Medicines Agency (EMA) before any product could be approved for patient use