how long does the vitamin b12 injection last A Shot Last? Affecting Factors of B12 What Are the Benefits of

Jette L, Leger R, Thibaudeau K, et al

Common side effects may include: Dizziness Pain, swelling, or itching at the injection site Diarrhea Nausea Skin rash or acne-like skin Unwell or feeling of weakness Serious side effects may include: Difficulty breathing Swelling of the face, lips, or tongue Irregular heartbeats or palpitations Swelling or pain in the limbs due to blood clots Severe dizziness or weakness This list does not cover all potential side effects, and others may occur

Comprehensive Management of Thalassemia: Beyond B12 Managing thalassemia goes beyond just B12 supplements

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Some people may also feel like their entire body is swollen, notes MedlinePlus

Testing before supplementing The most logical approach involves testing b12 status before adding supplementation