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The United States Food and Nutrition Board Some injection courses may provide up to 7 daily doses of 100 mcg, or up to 1000 mcg at once
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So it can be tough for a doctor to determine that vitamin B12 deficiency is the problem, unless youve taken a baseline test beforehand and already know that your B12 levels are lower than they should be
In contrast, cyanocobalamin, a synthetic form of B12, must be converted into Methylcobalamin or adenosylcobalamin in the body before it can be used
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