do you keep b12 injections in the fridge need to be refrigerated? How to Self-Inject Vitamin B12

You may be at greater risk for low B12 if you: Follow a vegan or restrictive vegetarian diet Have pernicious anemia Have had certain stomach or intestinal procedures Have Crohns disease, celiac disease, or another digestive condition Take medications that affect B12 absorption Have a previously diagnosed deficiency B12 is naturally found in meat, fish, eggs, and dairy products

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If B12 levels are low but still in range indicating a functional deficiency (this is a deficiency but blood tests appear in normal range) then second line testing of homocysteine and MMA can confirm B12 and/or folate deficiency