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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

It's this multifaceted potential that makes it such a compelling subject of study

A subset of prescribers combine oral and subcutaneous administration simultaneously (e.g., 250 mcg oral in the morning plus 250 mcg subcutaneous in the evening)

The health practitioner will prescribe the injection, usually monthly or bi-monthly, so keeping track of the injection schedule is not hard