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Risks While B12 injections are generally considered safe, especially when administered under medical supervision, there are some potential risks and side effects to be aware of: Pain, Redness, or Swelling at the Injection Site: This is the most common side effect and is usually mild and temporary

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Some people who take high doses may experience some mild symptoms such as headache and nausea

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The most effective way to boost your bodys vitamin B12 levels and help reverse symptoms like tiredness and brain fog, vitamin B12 injections are no longer available on the NHS from your GP