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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
This flexibility, along with the higher absorption rate, makes liquid B12 an attractive option for most people
You may also experience symptoms of injection site reactions such as redness, swelling and pain
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