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doi: 10.1074/jbc.M405499200
According to Dr Aravinda, high doses of vitamin B12 used to treat deficiency can cause: Headache Nausea and vomiting Diarrhoea Fatigue or weakness Tingling sensation in hands and feet Dr Aravinda further commented that possible interactions with other drugs include Aminosalicylic acid
Some studies show that anywhere between 200-800mcg per day is safe
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If you have been drinking alcohol or you take certain medications (like an oral contraceptive), your doctor will need to know that as well since some antibiotics can react unpredictably with these factors
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