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One source says 250mcg
This would be especially true where there is insufficient intrinsic factor produced and/or where the ileum of the small of the intestine is no longer present or able to absorb the vitamin B12/intrinsic factor complex
Some might need B12 shots for life to keep their levels up
itamin supplements are often used as a way to treat nutrient deficiency
Gastrointestinal Symptoms A B12 deficiency may cause symptoms such as bloating, gas, nausea, diarrhea, constipation, decreased appetite, and weight loss
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