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The NHS side-effects guidance for hydroxocobalamin, the form used in the UK, lists nausea, headache, dizziness and injection-site reactions as known effects that usually pass on their own

For most people, the effects last about one to two weeks, though the exact timeline shifts based on your current B12 levels, metabolism, diet, and how often you get injections

B12 supports enzymes that turn food into usable energy, which pairs well with sensible nutrition and movement

You will notice an increase in your energy levels almost immediately

Techniques such as meditation, yoga, or other relaxation methods can be beneficial