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This is why all B12 treatments experts advise not to retest B12 levels after treatment has begun as they are not a reliable guide to whether treatment is being effective
At typical research doses of 2.5-5 mg per day, a single 50 mg vial will generally last between 10 to 20 days, depending on your daily dosing schedule (once or twice daily)
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We store vitamin B12 in the liver some of it is continuously excreted with bile into the small intestine where its absorbed again
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