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Although naturally present in many foods, it's also eaten as a dietary supplement

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These include: Neurological symptoms : tingling or numbness in hands and feet (paraesthesia), difficulty walking, balance problems, memory difficulties, or mood changes Haematological signs : ongoing fatigue, weakness, pale skin, or shortness of breath suggesting anaemia hasn't resolved Glossitis : a sore, red tongue that hasn't improved Cognitive issues : continued difficulty concentrating or memory problems These symptoms, particularly progressive neurological deficits or severe anaemia with cardiorespiratory compromise, may require urgent medical attention

Accessed August 21, 2025

Widely used in research settings requiring complex compound combinations

Methylcobalamin is the most active, absorbable form of B12