Common side effects of B12 injections These B12 effects tend to resolve on their own within a day or two: Injection site reaction, such as mild soreness, redness, or swelling Brief itching or warmth at the injection area A feeling of fullness or pressure in the muscle Mild headache or nausea shortly after the shot These reactions are typically related to the injection itself, not the vitamin
Pernicious anaemia (PA) is an autoimmune condition which prevents the absorption of B12 in the gut due to a depletion in the main protein involved in B12 absorption
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