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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

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They may ask you to take a blood test to measure and monitor your B12 levels

This combination approach allows lower doses of each component, potentially reducing side effects while maintaining efficacy

Infants are particularly sensitive to b12 deficiency and low levels may result in stunted brain growth (R)

Research institutions benefit from this guarantee structure as it provides flexibility for experimental planning and budget management