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The animal data suggest lean mass is preserved, but human body composition data is lacking
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Oral supplements might work for some, however, as we age, our ability to break down oral supplements often decreases
(States that niacin should be used in pregnancy only if the benefit outweighs the risk
22,23 In patients with a normal or low-normal serum vitamin B 12 level, complete blood count results demonstrating macrocytosis, or suspected clinical manifestations, a serum methylmalonic acid level is an appropriate next step 1,2,6,18 and is a more direct measure of vitamin B 12 's physiologic activity
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