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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
and people with conditions that cause nutrient malabsorption and/or gastrointestinal blood loss (such as celiac disease, ulcerative colitis, and Crohn's disease)
They're not direct substitutes for each other
health mayo clinic B12 Shots & B12 Injections: Exploring the Good, Bad, and Alternative
US$ 23.06
US$ 22.80
US$ 21.63
