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Too much B12: Signs, causes, and how to manage it

Excess B12 from oral supplements is poorly absorbed at high doses (the body absorbs roughly 1 to 2% of a 1,000 mcg oral dose) and the remainder is excreted in urine

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Symptoms associated with vitamin B12 deficiency include fatigue and lack of energy (due to anaemia), and depression, psychosis and even dementia