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Feinstein, A., J

Side effects from B12 supplementation are uncommon but may include: Mild gastrointestinal symptoms such as nausea or diarrhoea, typically with very high oral doses Headache or dizziness in some individuals Skin reactions (rash, itching) at injection sites when using intramuscular preparations Rare but serious allergic reactions, including anaphylaxis with injectable forms Hypokalaemia (low potassium) may occur during rapid correction of severe megaloblastic anaemia If you experience symptoms of a severe allergic reaction (difficulty breathing, severe rash, swelling of face or throat) after taking B12, seek immediate medical attention

Insert air into the vial

The two mechanisms can be complementary in some plans

Because oral B12 supplements face a hostile digestive tract where up to 90% of the nutrient is lost, our clinical-grade intramuscular injections bypass the gut entirely

What will they be like with "Yes, B12 took away my dead leg"