can b12 injections cause diarrhea Vitamin deficiency symptoms and diagnosis Vitamin B12 overdose: Side effects

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So when I prescribe 1000 mcg daily, I am giving a large dose knowing that the absorption fraction is small

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Symptoms and signs of vitamin B 12 deficiency These include: fatigue depression lack of appetite problems with concentration changes in bowel habits (including constipation or diarrhea) CHECK shortness of breath or an inability to exercise pallor (pale skin) tingling or numbness in the hands and feet poor balance confusion or dementia

But too much B6 can harm nerves